bluuebunny/crossref_metadata_2025 huggingface dataset:
Messung der Oszillatorenstärken von SiI-, SiII-und SiIII-Linien im Wellenlangenbereich 1100 — 2600 Å und Vergleich des Vakuum-UV-Strahlungsnormals mit dem Kohlebogen
Authors: Hofmann W.
Published: February 2015

The oscillator strengths of 72 Si I-, Si II- and Si III-lines and multiplets in the wavelength region 1100 -2600 Å were measured in emission. The light source was a wall-stabilized arc burning in argon at atmopheric pressure into which small amounts of silicon tetrafluoride and fluorine were introduced. All oscillator strengths were measured relatively and then put on an absolute scale by using the value Anm = 1,64 · 108 sec-1 for the transition probability of the Si I-multiplet 2506 Å to 2528 Å.

The vacuum-UV intensity calibration method using the central intensities of optically thick lines in the cascade arc was extended up to the wavelength 2516 Å. In this wavelength region it could be directly compared with the radiation of the anode crater of the carbon arc. Full agreement between these two intensity standards was found.
Notizen: Zur Pulsationsdiffusion
Authors: Klemm A. , Müller K. P.
Published: February 2015

Diffusional transport through a capillary is greatly en­ hanced if the fluid is forced to oscillate. A rough calculation of the process agrees with experiments published recently by Drever, Kahrig, Kirstein, Erpenbeck and Lange.
Bestimmung der optischen Konstanten von Halbleitern an Proben mit nichtidealen Oberflächen
Authors: Jaumann J. , Werheit H.
Published: February 2015

Am Beispiel GaAs wird gezeigt, daß es möglich ist, die bei Durchlässigkeits-und Reflexions-messungen an planparallelen Proben durch Oberflächenstreuung auftretenden Intensitätsverluste näherungsweise aus den Meßwerten selbst zu bestimmen und bei der Berechnung der optischen Konstanten zu berücksichtigen.
Zur rotatorischen Bewegung eines Systems von n Massenpunkten. II
Authors: Ruder H , Volz H
Published: February 2015

In part I, the problem of the separation of a collective rotational motion from the internal motion in a system of point masses was discussed. It was shown that in the Hamiltonian H = H1+ Hk + H2, where H1 describes the internal, H2 the collective motion, the coupling term Hk in general cannot be eliminated by any choice of the internal frame of reference. This result applies to classical as well as to quantum mechanics. In this paper, the problem is further discussed on the basis of wave mechanics, especially for the case of the three-body-problem. Starting from the dependence of Hk on the connection of the internal frame with the configuration, we choose this frame in such a way that Hk Φ0 = 0, where Φ0 is the separated internal part of the wave function. Our procedure, which we call the method of specific decoupling, ensures that for the considered wave function and the corresponding frame of reference, the internal and collective motions are fully decoupled in that degree of perturbation which corresponds to the concept of rotational energies proportional to L2. It turns out that the condition Hk Φ0 = 0 is equivalent to a minimum principle for 〈H2〉. Thus the frame of reference in question can be found by solution of a differential equation as well as by variational methods. The Eulerian angles of that frame of reference respective to a fixed system of coordinates are the variables which enter the functions D1
mn (α, β, γ) describing the rotational motion of our system of point masses. In the course of our procedure, we immediately get effective moments of inertia. These are markedly smaller than the normal expectation values. Some simple models are quantitatively discussed. It is shown that the normally defined principal axes of inertia are no suitable starting point for the problem, because their connection with the configuration becomes undefined, when two principal moments are equal.
Kernmagnetische Relaxation in Chloroform
Authors: Dietrich W , Kosfeld R
Published: February 2015

Die kernmagnetischen Relaxationszeiten T1 und T2 von Chloroform wurden im Temperaturbereich von - 35 °C bis +90 °C erneut gemessen. Die experimentellen Ergebnisse zeigen, daß in diesem Temperaturintervall keine Spin-Rotationswechselwirkung vorliegt. Aus der transversalen Relaxationszeit wird für jede Temperatur die Spin-Spin-Kopplungskonstante A/2 π zwischen Chlorkernen und Protonen ermittelt.
Gegenstromelektrolytische Gewinnung von reinem Calcium aus geologischem Material
Authors: Bilal B
Published: February 2015

Mit Hilfe der Gegenstromelektrolyse wurde das Calcium geologischer Proben von den sonst schwer zu entfernenden Spuren der Begleitelemente Sr, Ba, Na und Mn in einem ein-zigen Arbeitsgang derart getrennt, daß sie aktivierungsanaly-tisch nicht mehr nachweisbar waren.

Auf die Eignung der Methode zur Trennung und Reindarstellung von Substanzen für die Aktivierungsanalyse wird besonders hingewiesen.
Zur Darstellung der Elektronen-Gitter-Wechselwirkung
Authors: Charlé K.-P , Haug A.
Published: February 2015

Im Gegensatz zu bisherigen Formulierungen, die spezielle Modelle und erhebliche Vereinfachungen enthalten, wird der Kopplungsfaktor der Elektronen-Gitter-Wechselwirkung für langwellige Gitterschwingungen durch eine Taylor-Entwicklung gewonnen. Es wird gezeigt, daß dabei kein Unterschied zwischen Normal- und Umklappprozessen besteht und daß der Kopplungsfaktor auch bei letzteren außer vom Elektronenanfangszustand nur vom Ausbreitungsvektor der Gitterschwingungen abhängt. Der Vergleich mit anderen Kopplungsfaktoren gibt Aufschluß über deren Güte.
Light Induced Modulation of Absorption (LIMA) of CdS Crystals
Authors: Böer K.W.
Published: February 2015

With chopped high intensity optical excitation a modulation of the optical absorption in a wide wavelength-range in CdS was observed. This light induced modulation of absorption is attributed to a redistribution of carriers over levels in the band gap following the chopping frequency. With this method the energy spectrum of certain traps and recombination centers can be determined and their frequency factor and capture cross section obtained. This method permits also the analysis of fast recombination centers.
Electroreflectance Observation of Internal Photoemission in InSb
Authors: Glosser R. , Seraphin B.O.
Published: February 2015

Electroreflectance is being used to determine the character of InSb surface layers exposed to uv irradiation. On n-type surfaces, such irradiation induces a charge transfer from band states into trapping states in the oxide layer, and the surface converts to p-type. Relevant parameters of this charge transfer such as threshold energy and rate of thermal recovery are determined for different surface conditions and temperatures. The convenience of electroreflectance as a continuous monitor of surface processes in InSb is pointed out.
X-Ray Induced Currents in Anthracene and Tetracene
Authors: Turiel I. , Kallmann H.
Published: February 2015

A new method which avoids making measurements or applying an external voltage while the X-rays are on, was used in investigating the ionization process by X-rays in organic crystals (tetracene and anthracene). The following results were obtained: The X-ray induced current is linear with electric field strength over a large range of field strengths and saturates at field strengths above 104 V/cm; it is proportional to the intensity of irradiation and to the thicknes of the sample for the same field strength; about 1500 eV are required to produce one charge pair in anthracene and 400 eV in tetracene. It was also found that the saturation field strength is independent of the X-ray intensity (the intensity was varied by a factor of ten). From these results it was concluded that recombination occurs mostly between the electron and the hole from which it was separated. It was also found that a large X-ray irradiation (8 x 105 ergs absorbed) produces trapping sites in the bulk of the crystal which trap charges and thus produce some bimolecular recombination.
Phosphoreszenzspektroskopische Untersuchungen an Carbazolketonen
Authors: Zander M.
Published: February 2015

Am 3-[3'-Methyl-naphthoyl-(2')]-carbazol (II) wird intramolekulare Triplettenergieübertragung beobachtet (Donator: Carbazolkern, Acceptor: Naphthalinkern) und im Zusammenhang mit an analogen Verbindungen erhaltenen Ergebnissen diskutiert. - 3-Aeetyl-9-methyl-carbazol (I) weist ungewöhnliches Phosphoreszenzverhalten auf (nichtexponentieller Abklingvorgang, starke Lösungsmittelabhängigkeit).
Decay Scheme of 79As
Authors: Leite C.V. Barros , Do Amaral L.C.M. , Jeronymo J.M.F , De Pinho A.G. , De Barros S. , Maurenzig P.R.
Published: February 2015

The y-transitions in 79Se following the decay of 79As were investigated with a Ge(Li) detector. Six previously unreported γ-transitions were observed and energy and intensity measurements on eleven γ-rays are reported. A new decay scheme is proposed which incorporates all the observed γ-rays. Results concerning the decay schemes of some isotopes of selenium (81 and 73) are also presented.
Abhängigkeit des optischen Bandabstandes von der molaren Zusammensetzung bei Zinksulfid-Kadmiumsulfid-Mischkristallen
Authors: Kotera Y. , Serine T.
Published: February 2015

The optical band gap was determined for powder samples of (ZnxCd1-x) S by absorption measurements using a microspectrophotometer. Whereas the lattice constants (measured by X-ray lattice analysis) are linear functions of the components, the band gap is smaller than expected from the molar composition. The relation between band gap and composition was found to be linear, with a break at the equimolar composition. Possible reasons of this phenomen are discussed.
Dynamic Polarization in Single Crystals of CaF2 Containing H Atoms as Paramagnetic Impurities
Authors: Zegers P.
Published: February 2015

Formulae for dynamic polarization in solids having an inhomogeneous electron spin system and a nuclear spin system which can be described by one single spin temperature were derived. It was assumed that the spin temperature, in the rotating frame of those paramagnetic centres which fulfil ωe=ω+ωn or ωe = ω-ωn j can increase due to thermal contact with the nuclear spin- system brought about by high microwave power. Field fluctuations, at the positions of the para­magnetic centres, due to relaxation flipping of surrounding nuclei and paramagnetic centres were also taken into account. Formulae obtained for the enhancement and polarization time as a func­tion of microwave power and for the enhancement as a function of field modulation frequency and -amplitude agreed well with the experimental results in CaF2 single crystals containing H atoms.
Ligand Hyperfine Interaction in the Complex [Mn(H2O)6] ++ in La2(Mg,Mn)3(NO3)12·24H2O
Authors: Ormondt D. van , Beer R. de , Brouha M. , Groot F. de
Published: February 2015

The elements of the hyperfine interaction (h.f.i.) between the manganese ion and the protons in the complex [Mn(H2O)6]++ in one of the two possible sites in La2(Mg, Mn)3(NO3)12 · 24 H2O have been measured with ENDOR at 15 to 20 K. The six water molecules in the complex at the chosen site are equivalent for reasons of symmetry.

One principal direction of the h.f.i. tensor of each proton is found to be perpendicular to the Mn, O line. With the assumption that each proton is located in the plane of the other two principal directions of its interaction tensor the positions of the protons are evaluated from the anisotropic parts of the h.f.i. tensors. In this calculation the effect of covalency on the anisotropic h.f.i. is ac-counted for with the aid of a simple model.

The isotropic h.f.i.'s with the two protons of a water molecule appear to be very nearly equal (+ 0.890 MHz for both). This latter result is remarkable in view of the fact that one proton is distinctly nearer to the manganese ion than the other.
Untersuchung des Einflusses von Leitsalz auf die ESR-Spektren neutraler und geladener Radikale in flüssigen Kristallen
Authors: Haustein H. , Möbius K. , Dinse K.
Published: February 2015

In the course of an investigation of electrolytically generated radical ions in the nematic mesophase of liquid crystals, we studied the influence of supporting electrolyte on the degree of molecular ordering. In the case of the radical anion of tetracyanoethylene (TCNE-) electrolytic generation results in a lower degree of ordering than chemical generation with sodium iodide. By using the neutral radical perinaphthenyl as a probe it was assured that the degree of ordering of the solvent is not disturbed by adding 0.1-m. tetrapropylammoniumperchlorate. A pronounced linewidth variation is observed for the chemically generated TCNE- which is attributed to spin density modulation by dynamic interaction with the Na+ counter ion.
EPR-Untersuchung an elektrolytisch erzeugten Semichinonen in flüssigen Kristallen
Authors: Haustein H. , Möbius K. , Dinse K.
Published: February 2015

Electrolytically generated semiquinone radical ions have been studied in the nematic mesophase of p-azoxyanisole by EPR methods. The degree of molecular ordering of benzo-, naphtho-, and anthrasemiquinones varied from 0.085, 0.18 to 0.20, respectively. The observed shifts of the hfs splitting constants and the g factors are in reasonable agreement with theoretical predictions. The negative sign of the C1
13 splitting constant of benzosemiquinone has been confirmed.
Isotopenaustausch-Untersuchungen an Silicat-Ionenaustauschern
Authors: Hoinkis E. , Levi H.
Published: February 2015

The isotopic exchange in Ba-and Sr-Zeolite X has been investigated over the entire range of the process. A special solution of the diffusion equation for the relevant case has been applied to evaluate self-diffusion measurements.

The diffusion process was found to be non-uniform. It has been shown that 80% of the ex-changeable Ba-ions and 65% of the Sr-ions diffuse with a high diffusion coefficient and the remainder with a low one. They differ by four to five orders of magnitude at room temperature. In the temperature range 120° to 0 °C the activation enthalpy for the slow process is about twice as high as for the fast process.

This behaviour is explaned in terms of cation location in the zeolite X lattice. The cations are accommodated in two types of channel systems which are assumed to be separated from each other at least with respect to alkaline earth ions. The cation position within the channel systems are discussed.
Gegenstromelektrolytische Stofftrennung in dünnen Flüssigkeitsschichten
Authors: Bilal B. A.
Published: February 2015

Es wird eine Anordnung beschrieben, in der die gegenstromelektrolytische Stofftrennung in einer dünnen Elektrolytschicht stattfindet. Die Eigenschaften der Anordnung hinsichtlich der Trennschärfe und Trennleistung, sowie die Verwendungsmöglichkeiten insbesondere für Anreicherungen im Bereich hoher Salzkonzentration werden mitgeteilt.
Excimerenbildung in organischen Flüssigkeiten bei Elektronenanregung
Authors: Joneleit D.
Published: February 2015

Emission-spectra and decay-times of benzene and some of its derivatives and of α-methylnaphthalene have been measured under electron-excitation. In most cases the spectra show a strong emission of excimers. The results can be interpreted self-consistently with a reaction-scheme used also for uv-excitation. However, this interpretation gives reaction-constants remarkably different from those measured for uv-excitation.
Notizen: A Superconducting Bolometer as a High Sensitivity Detector for Molecular Beams
Authors: Cavallini M. , Gallinaro G. , Scoles G.
Published: February 2015

The construction, operation and calibration of a superconducting bolometer is reported. Operated as a molecular beam detector the bolometer has, for Argon, a maximum sensitivity of 7 · 106 molecules sec -1 corresponding to a N.E.P. of 3 · 10-13 Watt Hz-½.
Über den Zusammenhang zwischen Selbstenergiefunktional und Ansprechfunktion eines wechselwirkenden Elektronengases
Authors: Kessel W
Published: February 2015

By linearizing the Dyson equation of the electron gas in an externally applied force field an integral equation for the adiabatic response function is derived. Its relation to the electron self-energy is considered which leads to certain approximations in the response function if the self-energy functional is given. This is illustrated for the case that the self-energy is a linear functional of the electron Green's function.
Untersuchungen zur Auftreffwinkelabhängigkeit des Emissionskoeffizienten für Sekundärelektronen und der Zerstäubungsausbeute beim Ionenbeschuß zylindrischer Proben im Plasma / Investigation of the Angular Dependence of the Secondary Electron Emission Coefficient and the Sputtering Yield by Ion Bombardment of Cylindrical Targets in a Plasma
Authors: Oechsner H , Gesang W
Published: February 2015

The influence of the angle of incidence of low energy ions on the emission of secondary particles from solid surfaces can be investigated by using cylindrical targets in a low pressure plasma. It is shown that the distribution of the angle of incidence of the impinging ions becomes independent of plasma conditions and bombarding parameters, when the diameter of the Langmuir sheath around the target is sufficiently large compared with that of the cylindrical target. Experimental results on the influence of the angle of ion incidence on the secondary electron emission coefficient and the sputtering yield are reported for polycrystalline Mo bombarded with A+-ions from 300 to 900 eV.
Wirkungsquerschnitte der Photoabsorption und Photoionisation des N2-Moleküls
Authors: Comes F.J. , Weber K.W.
Published: February 2015

The cross sections of photoabsorption and photoionization of the nitrogen molecule have been determined with high resolution (Δλ: 0.08 Å). The experiments demonstrate that the continuous absorption is overlapped by strong bands which are diffuse due to radiationless transitions. The competition of autoionization and predissociation leads to a strong variation of the ionization probability. Arguments are given to explain this behaviour of the nitrogen bands.
Messung kleiner Atomkonzentrationen in der Gasphase mittels Resonanzfluoreszenz im Vakuum-UV
Authors: Becker K.H. , Groth W , Jud W
Published: February 2015

The resonance fluorescence of atomic oxygen, nitrogen, krypton, and argon was measured in the vacuum-uv region as a function of the atom concentration. In a model the calculated fluorescence intensity is approximated to the experimental dependences by variation of a single parameter k0 . The best fit to the experimental data defines k0 as effective absorption coefficient in the central part of the resonance lines. The application of the resonance fluorescence as an analytical tool for atom reactions at low pressures is discussed.
Metastable Dissociation of CH5
+ Ions in the Methane Mass Spectrum
Authors: Mastan I , Mercea V
Published: February 2015

The main dissociation channels of the CH5
+ ion, i. e.

have been investigated by a mass spectrometric method. The pressure dependences of the ratios I14,90/I17 and I13,26/I17, in the range from 4,4·10-4 to 1·10-4 Torr, were plotted. The two ratios depend linearly on the pressure in the mass spectrometer analyzer. Since the two straight lines do not pass through the origine the conclusion is drawn that, for both dissociation channels of the CH5
+ ion, besides the collision-induced transitions, spontaneous transitions, i. e. pure metastable transitions, take place.

The spontaneous dissociations constants (λ1 = 7,5·105 sec-1 , λ2 = 5,2·104 sec-1) and collision-induced dissociation cross-sections (σ1 = 5,25 · 10-16 cm2 , σ2 = 3,2·10-16 cm2) have been estimated.

These results are discussed and compared with those reported by other authors.
Rotation-Vibration Interaction in the Microwave Spectrum of Fulminic Acid, HCNO
Authors: Bodenseh Hans Karl , Winnewisser Manfred
Published: February 2015

Rotational transitions in the microwave spectrum (20 - 46 GHz) of HCNO have been measured and assigned to seven excited vibrational states. The direct l-type doubling transitions of the II-component of the vibrational levels ν5 = 3 have been measured and analyzed, yielding the following values:

q(0)
3×5 = 27.0920 ± 1.8·10-4 MHz

EII - EΦ = Δ≅ 65 cm-1.
Fluorine Hyperfine Interaction in Aromatic Anion Radicals
Authors: Colpa J.P. , Fischer P. H. H.
Published: February 2015

The relation between the fluorine hyperfine splittings in about 20 fluorine substituted aromatic radicals and the π spin densities calculated according to McLachlans method is analysed with an expression of the type

aF = QF
FF ρπ
FF + QF
CC ρπ
CC + (QF
FC + QF
FC) ρπ
FC .

For the Q factors the following values are obtained:

QF
FF =931 gauss; QF
CC =86.6 gauss and (QF
FC + QF
FC) =345 gauss.

Two simpler expressions with one and two parameters respectively are also tested.

A theoretical estimate is made for the values of the Q factors and the results are compared with the values obtained semi-empirically.
Thermotransport of Gold in Solid Lithium Metal
Authors: Thernquist Per
Published: February 2015

The thermotransport of Au in Li metal has been measured, using a steady state technique. The effective heat of transport, Q**/g, of the Au impurity was found to be +4.1 kcal/mole, whidi is less than half the activation energy for isothermal diffusion of Au in Li. The diffusion mechanism cannot be determined unambiguously, but the results support the notion of interstitial transport.
Kernmagnetische Relaxation und Selbstdiffusion in Benzol
Authors: Dietrich W. , Gross B. , Kosfeld R.
Published: February 2015

Es wurden erneut die longitudinale Relaxationszeit T1 und der Selbstdiffusionskoeffizient Ds des Benzols zwischen 0 °C und 100 °C gemessen. Besondere Sorgfalt galt hierbei der Temperierung der Probe. Nach der Relaxationstheorie von HUBBARD erfordert die Temperaturabhängigkeit des Spin-Rotations-Relaxationsprozesses ein starkes Anwachsen des Quotienten aus Selbstdiffusions-koeffizient und longitudinaler Relaxationszeit. Es wird jedoch mit steigender Temperatur eine Abnahme von Ds/T1 entsprechend der Dichteänderung des Benzols beobachtet.

Hieraus folgt, daß der Spin-Rotations-Prozeß bei Benzol zwischen 0 °C und 100 °C keinen wesentlichen Einfluß auf die longitudinale Relaxation besitzt. Dadurch lassen sich die inter-und intramolekularen Anteile des Relaxationsprozesses allein aus temperaturabhängigen Messungen von T1 DS und ρ in einfacher Weise bestimmen.
Molten Mixtures of K, Na Formates with Alkali Halides. Note II * Concerning the exchange reactions
Authors: Leonesi Dante , Piantoni Giammario , Franzosini Paolo
Published: February 2015

By employing a visual method, solid-liquid equilibria were studied in a wide series of molten mixtures in order to draw the maps of the reciprocal systems formed with K, Na formates and bromides or iodides. Within the accessible portion of each system, five crystallization regions, three ternary eutectics and two saddle points were identified. The interdependence between the areas of some crystallization regions and the sizes of the halogen ions was put into evidence.
Massenspektrometrisches Verfahren zur Bestimmung der Sauerstoff-Selbstdiffusion in Gläsern
Authors: Schaeffer H.A. , Oel H.J.
Published: February 2015

Mass spectrometric method for determining oxygen self-diffusion in glasses A mass spectrometric method has been developed employing 0 18 labelled oxides in order to study isotope exchange between two different glasses. The method provides self-diffusion coefficients for compact glass materials below the softening points without restrictions of the diffusion annealing time. Concentration profiles were obtained by grinding off thin layers and analysing the ratio of O18 /O16 for each layer. The extraction of oxygen from the glass is based on the reduction by mercuric cyanide at 400 °C to yield carbon dioxide. As an example diffusion profiles of O18 have been measured in samples of two lead glasses. Diffusion coefficients were calculated applying diffusion equations for two-phase systems. The temperature dependence fitted an Arrhenius plot, thus indicating the activation energies. It has been shown that the distribution of O18 is controlled by oxygen self-diffusion and is not affected by the difference in chemical composition of the two glasses nor by physical or chemical solubility of oxygen from air-atmosphere.
Abscheidung der intermetallischen Verbindung Nb3Sn aus der Gas-Phase
Authors: Kim Kyong-Min
Published: February 2015

Thermochemical calculations and experimental investigations were made for the vapor deposition of the superconducting intermetallic compound Nb3Sn through the reduction of the component halides with hydrogen. The standard free enthalpy ⊿GT
0, the equilibrium constant Kp and the yield a were calculated. The influence of the gas composition and of the temperature on the stoichiometry and the yield of the deposited Nb3Sn were investigated.
Zur Charakterisierung eines Funktionssatzes unter besonderer Berücksichtigung quantenchemischer Aspekte
Authors: Preuss H.
Published: February 2015

An Hand aller Uberlappungsintegrale einer Funktionsbasis wird eine Analyse der Integralwerte-bereiche vorgenommen, die eine detaillierte Charakterisierung der Basis erlaubt.
A Finite-Amplitude Solution of the Self-Consistent Vlasov Equations
Authors: Lünow W.
Published: February 2015

The paper deals with the propagation of a finite-amplitude circularly polarized electromagnetic plane wave through a fully ionized hot collisionless plasma, composed of Q (≧1) types of ions and of electrons, as a strict solution of the non-relativistic self-consistent Vlasov equations within the scope of some given applicability criterions. A constant magnetic field and a constant total plasma stream, both parallel to the wave propagation direction, are allowed. Wave propagation and particle motion are separately discussed. Particularly, the possible existence of an anomalous wave, propagating with light speed through multi-component (Q>1) plasmas with arbitrary ratios plasmafrequency/wavefrequency, and the possible existence of multi-component plasmas with temperatures, far below thermonuclear temperatures, but under electromagnetically generated fusion conditions, are proved. The treated solution is of physical and astrophysical interest, likewise.
Double Shell Structure of the Periodic System of the Elements
Authors: Neubert D.
Published: February 2015

A new periodic system of the elements (PSE) is proposed which exhibits symmetry properties not apparent in the conventional arrangement of the elements. By discussing the solutions of the non-relativistic Schrödinger equation for the Coulomb problem it is shown that the PSE might be based on the filling of only four Coulomb shells as compared to the partial filling of up to eight shells in the conventional classification. On the other hand, the multiplicity of the states in the PSE appears to be four as compared to two due to spin in the hydrogen spectrum. A transformation of the PSE-spectrum into the hydrogen spectrum is possible by a rotation in quantum number space.
Photodissociation of H2 near Threshold Energies
Authors: Comes F. J. , Wenning U.
Published: February 2015

Measurements of the atomic hydrogen fluorescence (Lyα) yield important information on the dissociation behavior of molecular hydrogen under photon impact. Under certain assumptions the dissociation cross section of the molecule can be deduced from such experiments. By applying an appropriate electric field in the observation region those dissociations leading to the formation of metastable hydrogen atoms can be quantitatively determined. This information opens the possibility to describe the predissociation of the excited H2-molecules in the C-, D-and B″-states. The experiments show that the excited molecules in these particular states dissociate into H(1S) and H(2S) by configuration interaction with the B′-state.
Brillouin-Streuung in Strontiumtitanat-Einkristallen im Temperaturbereich 5 °K bis 300 °K
Authors: Laubereau A. , Zurek R.
Published: February 2015

Brillouin-Streuexperimente in SrTiO3 im Bereich der Phasenumwandlung von der kubischen zur tetragonalen Struktur werden mit Hilfe eines Modells für den Phasenübergang gedeutet, das Ergebnisse liefert, die der Theorie von Landau und Khalatnikow entsprechen. Die Phasenänderung wird als Ubergang 2. Ordnung betrachtet, bei dem die beobachteten akustischen Effekte unterhalb der Umwandlungstemperatur auftreten. Als Temperatur des Phasenüberganges wird der Wert 107 + 0,5 °K ermittelt. Die Größe der Stufe in den Brillouin-Verschiebungen konnte aus Literaturdaten, wie Änderungen der Gitterparameter, Drehwinkel der Sauerstoffoktaeder, soft-mode-Frequenzen, vorhergesagt werden. Die Übereinstimmung mit den experimentellen Ergebnissen ist zufriedenstellend. Die Messungen legen eine verhältnismäßig geordnete Domänenstruktur der untersuchten Kristallproben in der Tieftemperaturphase nahe mit einer Domänenorientierung entlang den Achsenrichtungen der kubischen Phase und überwiegend antiparallel ausgerichteten tetragonalen Domänenachsen. Die beim Anwenden einer äußeren Spannung im Brillouin-Spektrum beobachteten Änderungen werden als Umorientierung der Domänenachsen gedeutet
Eine automatische Apparatur zur örtlich und zeitlich aufgelösten Spektroskopie an Funkenentladungen
Authors: Tholl H. , Sander I. , Martinen H.
Published: February 2015

An automatical recording spectroscopic arrangement was developed to measure the side on distributions of the emitted light of spark channels at different times of the channel development. The radiation at two wavelengths was detected by means of two photomultipliers. The photomultiplier currents are applied to a two channel sampling unit which measures the amplitude of this currents at a fixed selected point of time. The output voltages of the two sampling channels are applied to the a:-inputs of two xy-plotters. By means of an image converter and a television scanning system it was possible to determine that part of the spark channel from which the photomultiplier had received the light. The scanning system produces an output voltage which is proportional to the radial distance of this observed part from the channel axis. This voltage is given to the y-inputs of the two xy-plotters. The spark channels are initiated "shot by shot" using a pulse generator, and the xy-plotters write down the side on distribution "dot by dot" for a fixed point of time. A programmable control and regulating system checks the whole measuring process
On the Equivalence between Cini-Fubini appro- ximants and diagonal Pade approximants
Authors: Georgalas C. G.
Published: February 2015

The Cini-Fubini approximants are equal to the diagonal Pade approximants to the S-matrix. In this paper a simple proof of this statement is given
Stoßbestimmte Grenzschicht in einem schwach ionisierten Plasma
Authors: Müller Karl Gerhard , Wahle Peter
Published: February 2015

In this work we develop a collision-dominated sheath model which includes the well known macroscopic models as extreme cases. We set up a description of the charge carriers with the help of the velocity distribution. In order to fulfil the microscopic boundary conditions at the wall we split up the velocity distributions into two parts. A basic set of new transport equations arises which differ from the usual equations by a correction term in the momentum transfer equations. Because of this splitting up of the velocity distribution we are able to take into account exactly specular reflection of the electrons at the wall. In a good approximation our results can also be obtained from the usual equations, if a suitably fitted factor is introduced into the electron boundary condition. at the wall.
On the Thermoelectric Power of Stabilized Zirconia
Authors: Pizzini S. , Riccardi C. , Wagner V. , Sinistri C.
Published: February 2015

Thermoelectric power of stabilized zirconia, at different CaO and MgO concentrations within the cubic phase, has been measured.

The results show a concentration dependence of the thermoelectric power which is preliminarly discussed.

The homogeneous part of the thermoelectric power, moreover, is discussed with the classical approach of irreversible thermodynamics.
Untersuchungen zum Niveauschema von 152Eu mit Konversionselektronen nach Neutroneneinfang / Studies of the level scheme of 152Eu by neutron capture conversion electrons
Authors: Kaiser Walther
Published: February 2015

With the beta-spectrometer at the research reactor near Munich the conversion-electron spectrum of 152Eu from slow neutron capture has been measured. In the range between 0 and 350 keV approximately 500 lines were found. For the low-energy-states a level scheme is proposed and compared with earlier level schemes of 152Eu. New transitions for the 9.3 h-isomer were found.
Hinderungspotentiale und Resonanzenergien von Nitrosobenzol und seinem Radikalanion / Potential barriers and resonance energies of nitrosobenzene and its radical anion
Authors: Kaminski W. , Möbius K.
Published: February 2015

For the nitrosobenzene radical anion the potential barrier of restricted rotation has been determined to be Ea = (8.6 + 0.5) kcal/mol. This result was obtained by comparing the ESR spectra of the radical at -78 °C and + 22 °C. The barriers of the radical ion and its neutral parent molecule are equal to the resonance energies of the -C6H5 and -NO fragments, which demonstrates that the restriction of the rotation is mainly due to resonance interaction.
Bemerkung zum Zusammenhang zwischen der Atomverteilung in einer Schmelze und in einem Gitter / A Remark on the Correlation between the Atomic Distribution in a Melt and in a Lattice
Authors: Ruppersberg H.
Published: February 2015

The radial distribution functions of simple liquids are often derived from a lattice by smearing out the lattice distances. The widening of the distance distribution is related to special disturbances which are assumed to be typical for the liquid state. It is shown that already the thermal vibrations lead to similar widenings, irrespective of two extreme possibilities for the kinetic behaviour of the atoms, namely lattice-like or corresponding to a linear chain with interactions between nearest neighbors.
Elektronenmikroskopische Untersuchungen an Tellur
Authors: Gottschalk H. , Kleinhenz K. , Wagner E.
Published: February 2015

In this paper a combined etching and electropolishing method to prepare thin Tellurium foils for transmission electron microscopy is described. This technique may be applied to massive sam-ples and is suitable for the preparation of thin foils at arbitrary points of deformed material. Speci-mens from deformed Tellurium single crystals were prepared in this way and examined in the electron microscope. Dislocations and grain boundaries were observed in these specimens.
Eine einfache Berechnung der Abbremsung schneller H-Atome durch kaltes H-Gas
Authors: Schäfer J. , Trefftz E.
Published: February 2015

In order to make a simple estimate of the thermalization of neutralized solar wind particles, classical elastic energy transfer cross sections are calculated for the H - H scattering process. A very simple approximation is also used for the macroscopic decelleration process. The estimated distance over which the hydrogen atoms lose half of their kinetic energy is 0.32 · 1018 cm and 24 · 1018 cm, for a starting velocity of 50 km/sec and 400 km/sec, resp., and for interstellar hydrogen density of 0.1 cm-3 . It appears that generally there is no thermalization shell around a star emitting a stellar wind.
Thermal Properties of Alkaline Earth Oxides II. Analysis of Experimental Results for MgO, CaO, SrO, and BaO
Authors: Gmelin E.
Published: February 2015

The heat capacities of MgO, CaO, SrO and BaO, reported in part I have been analysed in terms of the frequency spectrum of the lattice with the assumption that the effect of anharmonicity of the lattice may be neglected for T ≦ (ΘD/3).

Following the usual procedure the n-th moments of the frequency spectrum with n = - 3, -2, - 1, 0, 1 to 6 were calculated from the experimental data. From the low frequency expansion the apparent Debye characteristic temperature at 0 °K, Θ0, is calculated to be in good agreement with Θ0 (elast.), calculated from elasticity data. Also the limiting values at high temperatures,Θ∞, and the zero point energy, Ez, have been calculated.

A comparison between the heat capacity data, the elastic constants and thermal properties of these oxides and the alkali-halides suggest that the interatomic forces of the alkaline-earth-oxides are rather similar to those of the alkaline fluorides. But no specific divalent character has been detected for these oxides. An appreciable anharmonic effect is present for all oxides.
Massenspektrometrische Untersuchung der Sauerstoffverluste an heißen Rheniumoberflächen im Druckbereich 10–8 bis 10–4 Torr
Authors: Gross J.
Published: February 2015

The equivalent pumping speed of a heated rhenium surface for molecular oxygen has been measured. The surface was exposed to a constant oxygen gasflow and the oxygen pressure determined by means of a mass spectrometer. At a surface temperature of 2500 °K a pumping speed of Sn=7.6 ± 1.5 liters/sec cm2 was obtained for O2 . Because filaments of mass spectrometers have typically 5 to 10 mm2 heated surface this pumping speed may cause considerable errors during the calibration of the O2-sensitivity of mass spectrometers using rhenium filaments.
Relaxation des 5 1P1-Zustandes von Cadmium bei Stößen mit Edelgasatomen und Wasserstoffmolekülen
Authors: Pepperl R.
Published: February 2015

The linewidth of the Hanle effect signal of the orientation and alignment of the resonance level 5 1P1 of the cadmium isotop Cd114 is measured as a function of the pressure of various noble gases, of hydrogen and deuterium. The cross sections for broadening of the orientation and alignment signals due to atomic collisions are derived from the pressure dependence of the linewidth. The multipole depolarization-cross sections were found to be

In order to separate the depolarization effects from quenching effects in the case of hydrogen and deuterium polarization measurements of the resonance radiation were also undertaken. The alignment depolarization- and the quenching cross sections were found to
Lumineszenzuntersuchungen zum Problem der Energieübertragung in organischen Molekülkristallen
Authors: Belitz F.
Published: February 2015

From fluorescence spectra and decay times of single crystals of 2.3-dimethylnaphthalene, phenanthrene and p-terphenyl doped with one or two different types of fluorescence molecules (anthracene and, or tetracene) informations about the energy transfer processes are obtained. For doping concentrations smaller than 4·10-4 Mol/Mol the transfer by excitons is the main process. The dipole-dipole interaction over distances more than 80 Å (14 mean molecular distances) can be excluded. The mean travelling distance of the excitons in the three host lattices was found to be 250 - 300 mean molecular distances.
Notizen: Measurement of the Magnetic Moments of the Microsecond-isomers in 73As and 206Pb +
Authors: Quitmann D. , Jaklevic J. M.
Published: February 2015

The isomeric state of 73As (426 keV, 5.8 μsec) was produced and aligned by the reaction 71Ga (a,2n) in a liquid metal target. The anisotropics of the depopulating γ-rays were measured vs. the dc magnetic field applied perpendicular to the beam-detector plane. From the attenuation and rotation, we obtain g = + 1.03 ± 0.11. Limits of δ2 < 10-2 can be set to the multipole admixtures in both γ-transitions. The same technique was applied to the 123 μsee isomer of 206Pb (2200 keV) produced by 204Hg (a,2n). After estimating the relaxation time, g = - (0.035 ± 0.020) is obtained.
Notizen: Erzwungener Raman-Effekt an ausgedehnten Defektstrukturen in LiF
Authors: Heilmann G.
Published: February 2015

Raman-Effekt des idealen Kristallgitters von LiF tritt auf, wenn die 632,8 nm-Strahlung eines He-Ne-Lasers auf ausgedehnte Defektstrukturen mit Durchmessern in der Größenordnung von 10 ju und darüber fokussiert wird 1 . Die wichtigsten Merkmale dieser Spektren sind 1. das Auftreten von Linien, die Ein-, Zwei-und Drei-phononen-Prozessen zugeordnet werden können, 2. die geringe Intensität im Spektralbereich bis 1000 cm -1 , 3. das Verschwinden von Einzelheiten ihrer Struktur mit wachsender Intensität der anregenden Strahlung, das auf einen Schwellwert hindeutet, 4. ihr Fehlen in der vorwärts gestreuten Strahlung und 5. ihr Fehlen, wenn sich keine Defektstruktur der ge-nannten Art im Fokus der anregenden Strahlung befindet. Die Raman-Streuung im ungestörten Kristallinneren hat also nach 5. einen anderen Anregungsmechanismus als die hier beschriebene an Defektstrukturen. Eine solche Defektstruktur im Kristallinneren er-scheint bei ultramikroskopischer Beobachtung meist als nahezu kugelförmiger Kristallit. In 2 zeigen Abb. 1 und Abb. 2 einen besonders ausgedehnten Defekt, der auch zur Anregung von Raman-Spektren benutzt wurde. Ähnliche, als "negative Kristalle" bezeichnete Defekte gibt es z. B. auch in Cu20-Einkristallen 3 . Wie erst jetzt bekannt wird 4 , ist der zur Messung verwandte, farb-lose LiF-Einkristall Teilstück eines im Vakuum gezo-genen größeren, der zur Erzeugung von Farbzentren mit kurzwelliger Röntgen-Strahlung bestrahlt worden ist. Die Defekte sind nach dem Herstellungsverfahren der Kristalle wahrscheinlich Hohlräume. Wegen der Röntgen-Bestrahlung können sie auch F2 enthalten 5 . Ihre in den Kristall hineingewachsenen Oberflächen bleiben so vor äußeren Einwirkungen geschützt und sind daher als besonders gut zu bezeichnen. Damit ist gemeint, daß sich dort die Störung des idealen
Zur Theorie der Gegenstromelektrolyse
Authors: Gaus H.
Published: February 2015

In the case of stationary countercurrent electrolysis the one dimensional space dependence of the different concentrations is governed by a system of nonlinear first order differential equations. Here one takes into account the dependence of the electric field on the concentrations. One considers a mixture of completely dissociating salts with a common anion solved in an aqueous solution of the completely dissociating acid with the same anion. The equations are solved rigorously both in the homogeneous and the inhomogeneous case. One gets the concentrations and the space coordinate explicitly as a function of a parameter w, which is the electric potential divided by the diffusion coefficient. For infinitely long tubes the Kohlrausch-condition remains valid also in regions, where the profiles of the concentrations are influenced by diffusional transport. The results are applied to a process investigated by other authors
Impurity-induced and Second Order Raman Spectra of NaCl Crystals Doped with Different Ag+ Concentrations
Authors: Möller W. , Kaiser R.
Published: February 2015

Raman spectra of NaCl crystals doped with Ag+ ions up to 3.5 mol% have been measured in 4 scattering geometries. In the impurity induced part of the Eg- and F2g-spectra the strongest peaks are located at 85 and 171 cm-1. Their intensities increase proportional to the silver concentration. The second order Raman spectrum on the other hand appears to be independent of the Ag+ content. The spectra are fully explained by theory and by the assumption of Ag+ pairs
Zum zeeman-effekt im rotationsspektrum von molekülen mit interner rotation
Authors: Sutter D. , Guarnieri A.
Published: February 2015

The Hamiltonian for a molecule with internal rotation, rotating in an external magnetic field is derived. Spin effects are neglected
Intramolekulare Excimere: Die Kinetik ihrer Bildung und Desaktivierung
Authors: Klöpffer Walter , Liptay Wolfgang
Published: February 2015

A set of kinetic equations has been developed which allows to calculate the rate parameters of intramolecular excimer formation, dissociation and of radiative and non-radiative desactivation processes. Experimental data necessary for evaluating the equations are monomer lifetime and relative fluorescence intensities of monomer and excimer fluorescence in solution with and without added quenching substance.

Spectroscopical data of biscarbazolyl propane, diphenyl propane and derivatives are used in order to calculate the rate constants. It is shown that the stronger excimer fluorescence of diphenyl propane, as compared with biscarbazolyl propane, is due to the high rate constant of excimer formation in the former substance
Variational Principles for Compressible and Incompressible Systems
Authors: Krüger J. G. , Callebaut D. K.
Published: February 2015

Variational principles are established in the frame of macroscopic fluid theory including anisotropic pressure to compare an incompressible regime with any compressible one. It is shown that quite a general static equilibrium is not less stable than the same basic state of compressible fluid
Theorie der Lichtverstärkung in absorbierenden Medien
Authors: Rother W.
Published: February 2015

A general transient theory of light amplification in absorbing media is developed for small amplification and for small signal. The amplification by stimulated thermal Rayleigh scattering has been studied in detail for various shapes of the laser pulse. A transient gain is predicted when the frequencies of the pump and signal pulse are the same. The dependence of the amplification from the scattering angle was investigated. For narrow angles (Θ < 2 x 10-2 rad) scattering of higher order in angle was calculated. A method of measuring the Rayleigh linewidth with one laser pulse is proposed
Amplification of Light in Absorbing Media: Stimulated Thermal Rayleigh Scattering
Authors: Rother W. , Meyer H. , Kaiser W.
Published: February 2015

Using well defined input pulses the amplification by stimulated thermal Rayleigh scattering was investigated experimentally as a function of time (within the pulse), of absorption coefficient, and of interaction length. The frequency difference between the two interacting light pulses was varied with an accuracy better than Δν/ν = 10-8. Amplification was measured in the backward direction and at several degrees from the forward direction. The various experimental observations are in good agreement with theory. The possibility of determining material parameters in this amplifier system is discussed
Charakteristische Parameter der dielektrischen Relaxationszeit starrer Dipolmolekeln in verdünnter Lösung / Characteristic Parameters of the Dielectric Relaxation Time of Rigid Dipole Molecules in Diluted Solution
Authors: Hufnagel F.
Published: February 2015

The dielectric relaxation time of rigid polar molecules in dilute solutions is shown to depend exponentially on an effective molecular radius which is independent of the solvent. This relation contains a temperature-dependent structure parameter, the coefficients of which are used to calculate the activation energy and -entropy of the rate process. The resulting entropies are now more satisfying due to a new formulation of the scattering factor.

Similarly the viscosity of the solvent and its structure parameters are related by an exponential law. A characteristical length in this relation is a measure of the "hole distance" of the rate process. From both exponential laws follows that the dielectric relaxation time raised to the power of the ratio of effective molecular radius to hole distance is proportional to the viscosity of the solvent
On the Thermomagnetic Gas Torque for Collinear Static and Alternating Magnetic Fields
Authors: Hess S. , Waldmann L.
Published: February 2015

Results obtained within the framework of kinetic theory are presented for the part of the thermo-magnetic gas torque which stems from the thermal pressure and is associated with the influence of the magnetic fields on the viscosity (Senftleben-Beenakker effect). Good qualitative agreement and a quantitative agreement within a factor of roughly 1.5 are found between the theory and the experimental data of Smith and Scott [1969].