bluuebunny/crossref_metadata_2025 huggingface dataset:
Hanle-Effekt und Ausrichtungsgrad beim bewegten Leuchten / Hanle Effect and Degree of Alignment on High Velocity Atoms
Authors: Bachmann W. , Janke W.
Published: February 2015

Es wird eine neue Methode (Anregung durch Umladung eines schnellen Ions) angegeben, mit deren Hilfe man Relaxationsquerschnitte ausgerichtet angeregter Helium-Atome in einem Bereich untersuchen kann, der um 3 bis 4 Zehnerpotenzen höher als der thermische Geschwindigkeitsbereich ist. Aus dem Ausrichtungsgrad und dem Hanle-Effekt werden Depolarisations- und Löschquerschnitte in Abhängigkeit von der Relativgeschwindigkeit der Stoßpartner He(41D)+Ne, Ar und Kr bestimmt. Zur Deutung dieser Ergebnisse werden mehrere Transfer-Prozesse angegeben, die für die Löschung und Depolarisation verantwortlich sein können. Die Konstanz der Relaxationsquerschnitte in Abhängigkeit von der Geschwindigkeit wird für die beiden Stoßsysteme He(41D)+Ar und He (41D)+Kr mit dem „hard sphere potential“ gedeutet. Im Gegensatz dazu ist beim Stoßsystem He(41D)+Ne der Depolarisationsquerschnitt umgekehrt proportional der Relativgeschwindigkeit. Als zusätzliches Ergebnis wird die natürliche Zustandsbyte des He(41D)-Zustandes in guter Übereinstimmung mit den Ergebnissen anderer Meßmethoden erhalten.
Zur geometrischen Struktur von CF5
−, — eine wellenmechanische Untersuchung / The Geometrical Structure of CF0
− , a Wave Mechanical Investigation
Authors: Wang S.-J.
Published: February 2015

The geometrical structure of CF5
− has been ab initio investigated, taking all 52 electrons into account, using the MOLPRO-Programm/SCF-MO-LC-(LCGO)-Method. After approximating the core by means of the energy variation method and varying the ηp-values and the C - F-distance a total energy of - 517,7008 a. u. with a C - F4,5-distance of 2.78 a. u. and a C - F1,2,3 -distance of 2.74 a. u. for the CF5
−-system of the trigonal bipyramidal structure was found.

Likewise a total energy of -517.7036 a. u. with a C - F -distance of 2.58 a. u. in the tetraedral CF4 and a CF4 - F−-distance of 5.80 a. u. for the CF4 -F−-system was found. The best C-F-distance of the tetraedral CF4 was given at a distance of 2.51 a. u.

According to this investigation it can be concluded that the structure of the system CF4 - F− is the most stable one. An interesting result through the analysis of the electrondistribution is that the carbon atom is almost in all structure systems nearly unchanged.
On an Ionic Approximation to Homonuclear Bonding
Authors: Hooydonk G. Van
Published: February 2015

An ionic, i.e. basicly an electrostatic, approximation to homonuclear bonding between several monovalent atoms is examined. A simple correlation seems to exist between molecular constants (bond length and bond energy) and atomic constants (ionization energy and electron affinity). Bond stability is explained in terms of a saturation of the electron affinities of the bonding partners.
Measurement of Excitation Cross-Sections for Electron Impact at low Densities of Target Atoms
Authors: Karstensen F. , Pohl J.
Published: February 2015

In a crossed-beam experiment Na atoms are excited by electron impact with an energy of 11 eV. Determination of the excitation cross-section for the D-lines shows an increase of the measured cross-section with decreasing particle density in the atomic beam below 1012 cm-3.
Gleichzeitige Bestimmung von Elektronenkonzentration und Elektronenstoßzahl in einem örtlich langsam veränderlichen Magnetoplasma (Teil II) / Simultaneous Determination of Electron Concentration and Electron Collision Frequency in a Locally Slowly Varying Magnetoplasma (II)
Authors: Muschler W.
Published: February 2015

A preceding paper was concerned with the principles of a wave propagation experiment. These appeared suitable for a simultaneous determination of electron concentration Ne and of electron collision frequency v in a magnetoplasma. They considered measurements of the refractive index n and of wave polarization ϱ, both of which being determined by field strength ratios. In this paper supplementary numerical calculations are carried out using a plasma model that corresponds to conditions observable in the earth’s lower day time ionosphere and that is characterized by exclusively positive gradients of Ne . Furthermore, a modification of the original principle is discussed renouncing measurements of n and using only those of ϱ. Numerical calculations on error propagation demonstrate a significant superiority of the modified version. WKB solutions of coupled wave equations are used. As the plasma model includes local variations of the plasma parameters, the theory can be applied only to limited height and frequency intervals. These are deduced from the coupling parameter Ψ.
Supraleiter mit Schichten der A 15-Phasen Nb-Al und Nb-Al-Ge / Superconductor with Layer of the A 15-Phase Nb-Al(Ge)
Authors: Müller A.
Published: February 2015

A conductor has been prepared, consisting of Niobium and an outer layer of the A15-phase Nb-Al and Nb-Al-Ge respectively. The process involves two steps: Coating of Niobium by hotdipping and subsequent heat treatment. The procedure, the products of reaction and data on the transition temperature Tc and the critical current density J c of the A15-phase are reported. The maximum values obtained for Tc and J c are 18.5 K (19.3 K) and 5 · 104 A/cm2 (2 · 104 A/cm2) at 5 T and 4.2 K for Nb3Al (Nb3Al, Ge).
Begleitbanden der Null-Phononenlinien des Phosphoreszenzüberganges dotierter Cr3+: Alha6J3-Kristalle. Teil I. Lumineszenz / The Sidebands of the zero Phonon band of the Phosphorescence Transition in Cr3+ : Alha6J3 Single Crystals. I. Luminescence
Authors: Koglin E. , Krasser W. , Wolff G. , Nürnberg H. W.
Published: February 2015

The sidebands of the zero phonon band of the phosphorescence transition

are investigated in Cr3+:Alha6J3 single crystals for several Cr (III)-concentrations. At low Cr (III)-concentrations of 2 mol-% the electronic transitions can be assigned to the zero phonon transition of the phosphorescence and the corresponding phonon sidebands with the aid of polarisation measurements, the temperature behaviour of the bands and the isotope effect. Under the influence of a trigonal field D3 combined with spin-orbit coupling, both transitions

and

are observed. The phonon sidebands and the internal vibrational sidebands of the

transition are compared with infrared and Raman vibrational bands.

At a Chromium (III) concentration of 26 mol-%, some additional bands are measured nearby the

transition, which cannot be explained in the single ion crystal field model. There exists a super exchange interaction between the Cr3+-ions across the urea ligands. The interaction can be described by a Hamiltonian Hex = -JS1 · S2, which splits the 4A2-ground level into four levels | 4A2 ·
4A2〉 S = 0,1,2,3 with energy differences |J|; 2|J| and 3 |J|. In the phosphorescence spectrum the four transitions |2E · 4A2)〉S' = 1 → |4A2·4A2〉s = 0,1,2,3 are observed and the value of the exchange integral is calculated.
Alpha-Nucleus Potential and the Structure of the Alpha-Particle
Authors: Ceauşescu V. , Holan S. , Sandulescu A.
Published: February 2015

In the first order approximation, it is shown that the inclusion of higher shell model orbitals in the intrinsic wave function of the alpha particle gives alpha-nucleus potentials of the Woods- Saxon type with the same radius and diffusity as for typical nucleon-nucleus potentials and with a depth equal to the sum of the four nucleon-nucleus depths. We concluded that the alphanucleus potentials must have the same ranges for radius and diffusity as the nucleon-nucleus potentials.
Vaulting and Displacement of Pole-Covered 180°-Domain Walls
Authors: Markert H.
Published: February 2015

A zero approximation has been given of the normalized vaulting amplitudes of 180°-domain walls which are assumed to be vaulted between repulsive interaction lines if equilibrium has taken place between an external magnetic field and the counteracting forces resulting from the stray fields of the vaulting-induced free magnetic surface poles. Calculations have been carried out for two cases: cylindrical vaulting between linear barrier lines and pillow-shaped vaulting between isolated interaction points building up a tridimensional lattice of hindering points
Optical Absorptions in Metal Sodium: The Temperature Dependence in the Liquid State
Authors: Haider N. C.
Published: February 2015

The temperature dependence of optical absorptions in liquid Na is calculated. The electron energy values are obtained to second order in perturbation theory which are then used to determine the electron density of states. The density of states plots show some structure similar to those noted in the solid state. The optical conductivity in the liquid state is found to increase with the temperature as in the solid state. The present calculation for the optical conductivity gives a rather sharp peak around ħ ω = 1.7 eV. These results are in better agreement with the existing experimental results
Kinetics of Formation of SrWO4 in the Solid State Reaction Between WO3 and SrCO3
Authors: Flor Giorgio , Massarotti Vincenzo , Riccardi Riccardo
Published: February 2015

The solid state reaction WO3 + SrCO3 → SrWO4 + CO2 was studied with the reactants in form both of separate pellets and of powder mixtures.

As for pellets, by an application of Wagner’s method it was possible to state that the governing process is the cation counterdiffusion involving W6+ and Sr2+.

Thermogravimetric measurements in the temperature range 663° - 755 °C on equimolar powder mixtures and with SrCO3 in a specially prepared spherulitic form were interpreted using Dünwald- Wagner’s equation
Rayleigh-Taylor Instability of a Stratified Plasma
Authors: Srivastava K. M.
Published: February 2015

We have investigated the effect of finite Larmor radius on the Rayleigh-Taylor instability of a semi-infinite, compressible, stratified and infinitely conducting plasma. The plasma is assumed to have a one dimensional density and magnetic field gradients. The eigenvalue problem has been solved under Boussinesq approximation for disturbances parallel to the magnetic field. It has been established that for perturbation parallel to the magnetic field, the system is stable for both stable and unstable stratification. For perturbation perpendicular to the magnetic field, the problem has been solved without Boussinesq approximation. The dispersion relation has been discussed in the two limiting cases, the short and long wave disturbances. It has been observed that the gyroviscosity has a destabilizing influence from k = 0 to k = 4.5 for ß* = 0.1 and for ß* = 0.1 up to k* = 2.85 and then onwards it acts as a stabilizing agent. It has a damping effect on the short wave disturbances. For some parameters, the largets imaginary part has been shown in Figs. 1 and 2
Parsorbitalm ethode, 6. Mitt. : 1Charakterordnungen angeregter Zustände 2/ Character Orders of Excited States
Authors: Polansky Oskar E.
Published: February 2015

In spite of the complete neglect of spins in HMO theory different character orders are obtained for the lowest excited singlet and triplet states. Since 3φʟ* > 1φʟ*, possibly the typical reaction paths of tripletts are mainly determined by electronic factors
On the Calculation of Nonlinear Spinor Field Functionals. II
Authors: Stumpf H.
Published: February 2015

In preceding papers a functional quantum theory has been developped. In this theory the physical observables are derived only by functional operations from the corresponding state functionals. To obtain physical informations therefore the state functionals have to be known and calculational procedures have to be developped. As high energy phenomena are of interest the state functionals of the nonlinear spinor field are considered. In a preceding paper I a calculation method for bound state functionals has been proposed. In this paper this method is extended to the calculation of scattering state functionals, resulting in channel equations for the various scattering processes in the dynamics of the nonlinear spinor field.
Electromagnetic Transitions in 177Hf
Authors: El-Nesr M. S. , Bashandy E. , Mousa M. G.
Published: February 2015

The gamma transitions in 177Hf have been measured using a 50cm radius iron-free double focusing beta-ray spectrometer. The decay scheme is investigated and the K-conversion coefficients of the 208 and 321 keV transitions have been determined.

Comparison with theoretical conversion coefficients for pure El radiation calculated by Sliv and Band indicates that the K-conversion process of the 208 keV transition is normal while the large anomaly observed in the K-conversion process of the 32l keV E1 transition is compatible with a large M2 admixture or more probable with the presence of penetration matrix elements. From comparison with theoretical conversion coefficients the 113 keV M1+E2 transition has been found to be (95.12+0.6)% E2 corresponding to |δ| = 4.38±0.33. The decay scheme of 177Lu is discussed in terms of nuclear models.
Das Zeitgesetz der photochemischen Folgereaktion 1. Ordnung unter Berücksichtigung der inneren Lichtfilterwirkung / The Rate Expression for Photochemical Consecutive Reactions of the First Order with Conderation of the Internal Filter Effect
Authors: Mark Gertraud
Published: February 2015

The rate expression for the photochemical consecutive reaction of first order

, where A, B, and C absorb, is integrated in closed form. The concentrations can be given only as implicit functions of time. The approach can be generalized to derive closed, but implicit expressions for the concentration of A for photochemical consecutive reactions with an arbitrary number of first order steps.
Der Einfluß homöopolarer Bindungsanteile auf die Struktur anorganischer Salze IV. Salzartige Verbindungen / The Influence of Homopolar Bond Parts on the Structure of Inorganic Salts. IV. Salt-like Compounds.
Authors: Krebs H. , Weyand H.
Published: February 2015

It is shown that the s- and p-orbitals of the alkali atom valency electrons participate in the bond system of the alkali halogenides. The so-called ionic bond is merely an approximation. To prove this, the electron density distribution in LiF, the quadrupole and the superhyperfine electronnucleon interaction in Cr+-doted LiF, NaF and NaCl, and the influence of the s-orbitals on the superconducting properties of compounds containing alkali atoms are considered.
Untersuchung konkurrierender Reaktionen in strömenden Kohlenwasserstoff-Gemischen / Investigation of Competing Reactions in Flowing Mixtures of Hydrocarbons
Authors: Laupert R. , Bünau G. von
Published: February 2015

The reactions of atomic hydrogen with propene, butene-2, and trimethylethylene, and with mixtures of these olefins with ethylene have been studied using flow apparatus. It was found that under the experimental conditions intermediate alkyl radicals reacted practically only with atomic hydrogen. This made possible a kinetic evaluation of the results yielding numerical values of several relative rate constants of competing intermediate reactions.
Zur Variation von Lumineszenz-Lebensdauern durch eine dielektrische Grenzfläche
Authors: Tews K. H.
Published: February 2015

A theory of the luminescence lifetime of a radiation-damped classical electrical point dipole near a plane interface to a medium with different optical constants is given. The influence of the interface on the lifetime of the dipole is calculated in first approximation with the methods of molecular optics. Theoretical and experimental results for a purely dielectric interface are compared.
Spektroskopische Bestimmung der Dissoziationsenergie von AlO aus Gleichgewichtsmessungen in Flammen
Authors: Frank P. , Krauss L.
Published: February 2015

Measurements of particle concentrations of Al and AlO are performed in premixed laminar H2/O2-flames with additives of organic aluminium compounds. Using the oscillator strengths in electronic-vibronic transitions of AlO published by Michels 1, absolute number densities for different equilibria in the range 2750 - 2980 K are determined. By means of second law and third law plots a dissociation energy for AlO of 5.06 ± 0.08 eV is achieved. This value is in agreement with recent results obtained from mass spectroscopic techniques by Hildenbrand 2.
Appearance Potentials of Field Ions
Authors: Heinen H. J. , Röllgen F. W. , Beckey H. D.
Published: February 2015

The appearance potentials (AP) of various ions, which are produced by field ionization at platinum tip emitters have been measured by a retarding potential energy analyzer coupled to the output of a single-focusing magnetic mass spectrometer. Adsorption layers of water and organic molecules on the emitter surface were found to have no significant influence on the AP measurements. The APs of the H3O+ and (H2O)2H+ ions in the water spectrum and the CH3OH2
+ and (CH3OH)2H+ ions in the methanol spectrum suggest that the emitter surface is involved in the protonation reactions. The APs of the other ions in the water and methanol spectra have also been studied. The APs of the molecular ions of the paraffins allow conclusions to be drawn about the energy deposition function for field ionization. The fragment ions of n-heptane were found to have surprisingly low APs, up to 2.4-eV less than the molecular ion. The AP of the CH3
+ ion in the methane spectrum indicates that it arises from a surface reaction.
Die Abhängigkeit der Fluoreszenzquantenausbeute von der Anregungswellenlänge bei Carbonylverbindungen des Pyrens
Authors: Kröning P.
Published: February 2015

Pyrene-3-aldehyde, 3-acetylpyrene and 3-benzoylpyrene show almost no fluorescence in dilute solution in non-polar solvents. In more concentrated solutions, however, a long wave fluorescence is observed, showing the existence of weak intermolecular forces, even in the ground state. In polar solvents, pyrene-3-aldehyde and 3-acetylpyrene exhibit short wave monomer fluorescence whilst 3-benzoylpyrene does not fluoresce. The intensity for both long and short wave fluorescence is dependent upon the excitation wave length and is a maximum for excitation in the weak long wave tail of the first absorption band. Molecules are thought to have a greater absorption in this region if they interact strongly with their polar or polarizable surroundings. Due to the very short singlet lifetime of isolated monomers (τ<C10-10 sec), such molecules have a greater probability of forming a fluorescence state than more weakly interacting ones.
Measurements of C2 Radicals in Flames with a Tunable Dye-Laser
Authors: Becker K. H. , Haaks D. , Tatarczyk T.
Published: February 2015

By laser excited fluorescence using extra-cavity techniques the C2(a3πu) radical concentration in an acetylene oxygen atom flame was measured in comparison to the emission intensity from C2(d3πg) radicals which are produced by chemiluminescent reactions.
Aufbau eines ESR-Superheterodyne-Spektrometers, geeignet für Mikrowellen-Transmissions-Messungen an Metallen / ESR Microwave Transmission Measurements on Metals
Authors: Domdey H. , Voitländer J.
Published: February 2015

A two cavity microwave transmission experiment was carried out at a frequency of 9,3 · 199 cycles/sec. A transmission resonance signal was observed through thin sheets of the paramagnetic metals Lithium and Gadolinium when placed as a common wall between the two cavities. The microwave part of the ESR-spectrometer is described and experimental results are given.
Energy Loss Analysis in Bloch Waves
Authors: Fujimoto F. , Lehmpfuhl G.
Published: February 2015

In electron diffraction experiments with a single-crystal wedge Bloch waves can be analyzed directly because of their separation into partial waves when leaving the crystal. In a two-beam case the diffraction spot is split into a double representing two partial waves of the two Bloch waves. The energy-loss spectrum in the 220 doublet of MgO was investigated with a Möllenstedt velocity-analyzer. Two loss peaks at about 14 and 22 eV were found in each Bloch wave. Thermal losses were identified as a background in the no-loss peak.
Hidden Rearrangements in the Mass Spectral Decomposition of Cycloheptatriene
Authors: Hoffman Michael K.
Published: February 2015

Observations concerning the mass spectral decompositions of the toluene and cycloheptatriene molecular ions are reviewed. A mechanism is proposed which explains in a unified manner the apparently conflicting and unresolved isotopic scrambling results. QET calculations supporting this mechanism are presented.
Particle Number Dependence of Collective Properties of Nuclei in the Rare Earth Region
Authors: Rafelski H. , Fink B.
Published: February 2015

Within the framework of the pairing plus quadrupole interaction model and by using the technique of quasi spin formalism it is possible to determine the collective potential and kinetic energy surfaces as analytic functions of the particle number in the limit that single particle splittings are neglected. Pushing the quasi spin model in an extended version up to the 4th order in perturbation theory the stiffness and mass parameters of harmonic and anharmonic terms for Dy, Er, Yb, and Hf-isotopes have been calculated. The theoretical particle dependence of collective quantities shows a good qualitative and even quantitative agreement with experimental data and former calculations.
Vergleich optischer und elektrischer Messungen an Cu-, Ag- und Au-Schichten mit unterschiedlicher Fehlstellenkonzentration / Comparison of Optical and Electrical Measurement on Cu, Ag and Au Films with Different Lattice Defect Concentrations
Authors: Bispinck H.
Published: February 2015

The optical constants, d. c. conductivity and Hall-effect were measured in UHV for evaporated films of Cu, Ag and Au (thickness approx. 100 nm) which were quenched, condensed and stepwise annealed. For the range of wevelengths chosen (0.9 - 2.4 μm), a density of conduction electrons and their damping frequency can be determined from the optical constants by using the Drude theory. If one compares these data with the corresponding electrical measurements, a very similar behavior is shown for the recovery. The electron density increases by a factor 1.3 - 1.6, whereas the damping frequency decreases by a factor 1.7 - 2.8.
A Molecular Dynamics Study of Aqueous Solutions I. First Results for LiCl in H2O
Authors: Heinzinger K. , Vogel P. C.
Published: February 2015

First results of a molecular dynamics study of an aqueous LiCl solution are reported. The system investigated consisted of 216 particles, 198 water molecules, 9 lithium ions, and 9 chloride ions. The calculations lead to fair agreement with the static properties of the first hydration shells of the ions as derived from X-ray and neutron diffraction studies, and with kinetic properties as derived from NMR measurements. A model for the motion of the water molecules in the first hydration sphere of Li+ is tentatively proposed.
Viskosimetrische Untersuchungen zur Frage nach dem Aufbau flüssiger Quecksilber-Thallium-Legierungen / Viscometric Investigations on the Structure of Liquid Mercury Thallium Alloys
Authors: Predel Bruno , Arpshofen Ingo
Published: February 2015

By means of a capillary tube viscometer we have investigated liquid Hg-Tl alloys in the temperature range from 20° to 90 °C.

On the basis of the experimental results it can be concluded that associations with the stoichiometric composition Hg3Tl are existing in the liquid Hg-Tl alloys. The percentage of these associations is dependent on the concentration, and furthermore, on temperature. The maximum percentage at 25 °C and 25 at % Tl is about 20 at %.
On the Theory of Spectral Line Widths of Coupled Many Wave Systems in Non-Thermal Equilibrium
Authors: Wonneberger W.
Published: February 2015

The problem of the natural spectral line width ⊿ω oi individual waves of a coupled many wave system in non-thermal equilibrium is discussed within the Fokker Planck approach to fluctuation phenomena. Edwards' method in turbulence theory is reinterpreted to relate ⊿ω via a modified energy balance equation to the spectrum of the mean wave intensities. This equation is solved for a model of the non-resonant feedback laser. ⊿ω is found to consist of two contributions: The first one is associated with the usual internal noise of a "free" Gaussian wave due to spontaneous emissions. Its contribution to the line width is twice that of a single mode laser far above threshold as found earlier by Brunner and Paul. The second and new contribution stems from the wave-wave coupling. It is similar to half the effective intensity fluctuation line width of the single mode laser and thus dominates above threshold.
Diffusionsuntersuchungen im System Ti-Zr mittels Mikrosonde / Interdiffusion in the System Ti-Zr
Authors: Brunsch A. , Steeb S.
Published: February 2015

Diffusion processes were investigated by means of quantitative electron probe microanalysis in the system Ti-Zr. The annealing temperatures ranged from 650 °C up to 1050 °C. The law d~t½ is valid for the growing process of the total diffusion zone at all temperatures under observation. Grain boundary diffusion can be excluded. The coefficient of interdiffusion was determined. It ranges from 10-10 up to 10-8 cm2 sec-1 and shows a slight rise with increasing Ti-concentration. The Arrhenius plot of the coefficient of interdiffusion shows two regions with an Arrhenius law valid for each region. The frequency factors and activation energies of the two regions approach with rising Ti-concentration. At 800 °C the Kirkendall effect could be observed. It yields the intrinsic diffusion coefficients. The intrinsic coefficient of Zr is larger than that of Ti.
Thermoelectric Power and Electric Conductivity of the (Ag, Na) Cl and (Ag,Na)Br Solid Solutions
Authors: Magistris A. , Schiraldi A. , Chiodelli G.
Published: February 2015

The electric conductivity and the initial thermoelectric power are determined for the solid solutions (Ag, Na)X (X = Cl, Br) over the whole composition range.

Data drawn from both kinds of measurements allow to approximately estimate the contributions of cation vacancies and interstitial Ag* to the transport process.

Two composition regions are distinguished: 0≦NNaX≦0.6 and 0.7<NNaX<1 where interstitial Ag+ and cation vacancies, respectively, are prevailing.
Dynamik des Zerfalls von Inversionswänden in einem nematischen flüssigen Kristall / Dynamics of the Annihilation of Inversion Walls in a Nernatic Liquid Crystal
Authors: Heppke G. , Schneider F.
Published: February 2015

Inversion walls are generated by rotating the direction of a magnetic field by 180° with respect to the director in the homeotropically aligned nematic layer. A numerical procedure based on the Leslie-Ericksen theory allows for the calculation of the dynamic behaviour of the inversion walls. Experimental results obtained with MBBA by electric conductivity measurements show satisfying agreement with theory.
Notizen: A New Band System of N2+ Excited from Impact by Hydrogen Ions on a Nitrogen Target
Authors: D'lncan Jean , Topouzkhanian Ari
Published: February 2015

A new molecular spectrum has been observed in the 3820 - 3920 Å region by submitting nitrogen molecules to the impact of hydrogen ions in the 5-30 KeV energy range. The most intense band may be attributed to the (0-0) transition of a new system 4∑u+ →X2∑g
+ of N2
+. The following molecular constants have been determined: Te=3,16 eV, re=1,077 Å, 3ε=0,7 cm-1 for the quartet state.
Mean Life Times of the Excited State of n→π* Transitions of the Nitroso Group in Cupferron
Authors: El Ela A. H. Abou
Published: February 2015

The mean life times of the excited state of the n→π* transitions of the nitroso group have been computed from observed spectra of cupferron in different solvents. The results are discussed in the light of various possible perturbations of the electronic states.
Classical Annihilation Radiation
Authors: Liboff Richard L. , Maresca Neal J.
Published: February 2015

An expression for the total energy £r of radiation associated with the classical annihilation of two uniformly moving massless charge distributions which are identical except for sign is obtained. The energy is found to be generated by the processes of bremsstrahlung, pair interaction, and static field cancellation whose contributions give the result εR = 2 γ β2 ε0 where ε0 is the charge distribution self-energy. Application of the results to several sample charge distributions supports the conjecture that infinite acceleration of charge does not necessitate infinite radiated energy. A criterion for the finiteness of total emission is established with respect to the self-energies of the charge distributions. For the case of non-zero mass distributions, a formula for the total energy of annihilation is developed, suggesting an annihilation event to be interpretable in terms of the separate annihilation of electromagnetic and inertial mass.
Messung der Kontinuumstrahlung von Krypton und Xenon in einem durch Stoßwellen aufgeheizten Plasma
Authors: Carls Hans-H.
Published: February 2015

We report on the measurement of the Recombination Continuum of Krypton in the wavelength region between 2300 Å and 3600 Å. The plasma behind a reflected shock has been used as a light source. Good agreement was found between measured absorption coefficients and theoretical ones if the electron density was measured from the broadening of the Balmer line Hβ, while the measurements show departures by a factor 5 to 9 from Rankine-Hugoniot predicted values. Possible deviations from ideal shock behaviour are discussed.
Ein Modell zur verzögerten Fluoreszenz von Anthracen/Tetracen Kristallen
Authors: Wolff H.
Published: February 2015

Spectra and decay-times of delayed fluorescence in anthracene single crystals doped with tetracene at concentrations ranging between 3·10-10 to 3·10-5 were measured (T = 300°K). The dependence of the relative intensities and the decay-times on the concentration is explained by a simple model: The triplet-excitons of the host-lattice are captured by triplet traps localized in the nearest neighbourhood of the guest molecules. Than, the energy either goes to the tetracene, or thermally stimulated back into the triplet exciton band. The energy transfer of singlet excitons is taken into the considerations. The differential-equations describing the model are approximative^ solved. The solutions are compared with the experimental results. From the measurements a transfer rate K= (1.1 ± 0.4) · 104 for singlet excitons is derived, corresponding to a velocity constant of ks = 5.5 · 1011 s-1 (at p = 0.7 ± 0.07). The transfer of triplet excitons is governt by the constant k = 2 · 1011 s-1 . This corresponds a diffusion constant of triplet excitons D= (1.25 ± 0.2) · 104 cm2 s-1 . The lifetime of the tetracene triplet state within the antracene lattice is found to be τ = ( 1.09 ± 0.1) · 10-3 s.
55Mn NMR Studies in Aqueous Permanganate Solutions
Authors: Lutz O. , Steinkilberg W.
Published: February 2015

The NMR signals of the nuclei 55Mn and 2H have been investigated in aqueous solutions of permanganates. The concentration dependence of the NMR signals of 55Mn has been determined in potassium permanganate solutions in H2O and D2O and a large solvent isotope effect on the chemical shift of 55Mn has been established. The ratio of the Larmor frequencies of 55Mn relative to 2H has been measured with high accuracy. Using the concentration dependence, the ratio of the Larmor frequencies of 55Mn for infinite dilution relative to 2H in pure D2O is given. From this ratio a magnetic moment for 55Mn in the permanganate ion has been derived.
Gravimetrie Interdiffusion Measurements in Molten Halides at Temperatures up to 1000 °C
Authors: Behn Anders , Sjöblom Carl-Axel
Published: February 2015

The interdiffusion coefficient of bromide ions at low concentration in molten silver chloride has been measured with the gravimetric technique, and it can be "least-squares" fitted into the equation D23 = 6.58 x 10-4 exp { - (4280 ± 110) / RT) (503-820 °C) where D23 is expressed in cm2 s-1 and RT in cal equiv-1 . Friction coefficients as defined by Klemm do not indicate association between the chloride and bromide ions. The interdiffusion coefficients of potassium ions in molten sodium chloride at 900 °C and of sodium ions in molten potassium chloride at 995 °C, both at low concentration, have been found to be approximately 2 x 10-4 cm2 s-1
Zur innermolekularen elektronischen Relaxation des freien Benzols nach Elektronenstoßanregung
Authors: Hartfuß Hans J.
Published: February 2015

A crossed-beam-experiment was built up, which allows to determine spectra and decay-times of the target-molecules. The energy of the exciting electrons is 200 eV. The maximum density in forward direction of the molecular beam equals a pressure of 6·10-4 Torr, much below the lowest pressure, where pressure-induced relaxation is observed. The following target-molecules were used:

C6H6 , C6D6 , C6H5F, C6H5Cl . The measured decay-times are evaluated with the quantum-yield-data of other authors, to determine the relaxation-times for the Intersystem-Crossing-process 1B2u →
3B1u of Benzene. A comparison with theory gives the interaction-energies between singlet- and triplet-BO-states. The energies are of the order of 10-9 eV.
Microwave Spectrum and Dipole Moment of Methylenecyclobutenone
Authors: Czieslik W. , Carpentier L. , Sutter D. H.
Published: February 2015

The microwave spectrum of Methylenecyclobutenone has been investigated in the vibrational ground state in the range of 8 to 26.5 GHz. From a least square fit of 12 lines with J ≦ 4 the rotational constants have been calculated as A =5.775664±0.000009 GHz, B = 4.312314 ± 0.000007 GHz, C = 2.467814±0.000008 GHz. The inertia defect Δ = - 0.09 amuÅ2 indicates that the molecule is planar. From Stark-effect measurements the components of the molecular electric dipole moment were obtaied as |μa| = 2.04 ± 0.02 D, |μb| = 2.70±0.03 D, |μtotal| = 3.39 ± 0.05 D.
Optische Simulation der Doppelbeugung bei LEED
Authors: Hilferink Heinz , Klingshirn Claus , Müller Klaus
Published: February 2015

Double diffraction in optical simulation is a useful tool for the interpretation of LEED patterns. A particular example is the case of Cs/W(100).
UN-Sector and Compositeness Conditions in the Bronzan-Lee Model
Authors: Choudhury A. L.
Published: February 2015

The Lehmann-Symanzik-Zimmermann (LSZ) technique has been used to calculate all τ -functions of the UN-sector of the Bronzan-Lee model. Using the prescription of Liossatos, the ZV → 0 limit has been carried out for the fourier transform of the τ-functions in the sector. These limiting functions τ̂α,L
UN are then compared with the τ̂C,α
UN functions derived from a composite model, proposed by the foregoing author, where V is considered to be a composite particle. It has been found that when the so called composite V-particle does not appear in the initial and the final states, these τ-functions coincide. On the other hand, the limiting values of some τ-functions differ from those of the composite model, when such particles appear in the final or initial states.
Untersuchungen zur Ladungsträgerbilanz einer Reflexentladung im axialen Magnetfeld / Investigations on the Particle Balance in a Reflex Discharge with an Axial Magnetic Field
Authors: Himmel G. , Möbius E.
Published: February 2015

A simple model for the particle balance in a reflex discharge with a superimposed axial magnetic field is presented based upon the results found for the negative glow of an anomalous glow discharge. The electron density and temperature of hydrogen and helium discharges are determined as functions of the discharge current, pressure and magnetic field; the ion current of a cylindrical Langmuir probe is evaluated according to the theory of Laframboise. Additional information on the ion composition of the plasma is obtained by comparison of the probe measurement with interferometric microwave measurements. The reflex discharge produces a negative glow plasma with Te = 2000 - 3000 °K and densities up to ne = 1013cm-3. For pressures below 0.01 Torr and strong magnetic fields the negative glow is transformed into a Penning discharge.
Classical, Covariant Finite-size Model of the Radiating Electron
Authors: Sorg M.
Published: February 2015

The finite extension of the classical electron is defined in a new, covariant manner. This new definition enables one to calculate exactly the bound and emitted four-momentum and to find an equation of motion different from the Lorentz-Dirac equation and from other equations proposed in the literature. Neither mass renormalization nor use of advanced quantities nor asymptotic conditions are necessary. Runaway solutions and pre-acceleration do not occur in the framework of the model presented here.
Rotationsspektrum von BaO / Rotational Spectrum of BaO
Authors: Tiemann E. , Bojasehewsky M. , Sauter-Servaes Ch. , Törring T.
Published: February 2015

With the new saturation modulation the rotational spectrum of BaO was measured. The accuracy of the derived molecular constants is about an order of magnitude higher than in previous studies and some discrepancies are removed. It was demonstrated that measurements of the electric dipole moment are possible with microwave spectroscopy up to temperatures of 2000 K.
gJ-Faktor der Molekeln SiO und PbTe und Anisotropie der Magnetisierbarkeit von SiO / Molecular gJ-Factor of SiO and PbTe and Magnetic Susceptibility Anisotropy of SiO
Authors: Honerjäger R. , Tischer R.
Published: February 2015

The gJ-factor of the molecules 28Si16O and 208Pb130Te and the magnetic susceptibility anisotropy ξT

of 28Si16O have been measured in the ground vibrational state:

The molecular quadrupole moment and its electronic part are derived for the SiO molecule from gJ, ξT , and the rotational constant B0 .
Untersuchung der alkalischen Hydrolyse des Benzoesäurebenzylesters in Wasser-Äthanol 1 : 1 / Study of the Basic Hydrolysis of Benzyl Benzoate in Water-Ethyl Alcohol 1:1
Authors: Mansilla F. , Martinez P. , Sancho J.
Published: February 2015

By using a conductometric method, the kinetics of the basic hydrolysis of benzyl benzoate in water-alcohol medium has been investigated. The second order rate constant follows the equation K = A exp {-E/RT} with A = 1.35·1010 l mol-1 min-1 and E = 14.5 kcal mol-1. A reaction mechanism is postulated, which is consistent with the experimental data.
Torque on a Rotating Ellipsoid in a Rarefied Gas
Authors: Halbritter J.
Published: February 2015

A particle, shaped as an ellipsoid of revolution and rotating about an arbitrary axis, experiences a torque in a rarefied monatomic gas because of the impact with the gas atoms. This torque is calculated for the case where the linear dimensions of the ellipsoid are small compared with the mean free path of the gas. The interaction of the gas atoms with the ellipsoidal surface is taken into account by means of the boundary condition for the distribution function in terms of an accommodation coefficient (diffuse and specular reflection). The torque is considered for prolate and oblate ellipsoids. The formulae obtained are of interest in the theory of the Brownian motion of a rotating particle in a rarefied gas.
Precision Measurements of Magnetic Moments of Nuclei with weak NMR Signals
Authors: Sahm W. , Schwenk A.
Published: February 2015

Two NMR spectrometers were combined and a special probe assembly was constructed in order to enable a simultaneous measurement of the signals of 2H and any nucleus, the gyromagnetic ratio of which is <1.4·107T-1sec-1. The Larmor frequencies of 39K, 73Ge, and 109Ag in well defined samples were referred very accurately to the resonance of 2H in D2O. It was possible now, to refer the Lamor frequencies of the nuclei 41K, 57Fe, 87Sr, 107Ag, 183W, 187Os, which were previously referred to the resonance of one of the nuclei mentioned above, to the Larmor frequencies of the deuteron and the proton in D2O or H2O.

The magnetic moments of all these nuclei are given.
An SCF MO Treatment of the Conformations of the 1,3,Dimethyl Allyl Carbonium Ion
Authors: Shanshal Muthana
Published: February 2015

The geometry and heat of formation are calculated by means of the MINDO/2 method for the following six conformations of the 1,3,dimethyl allyl carbonium ion: the cis,cis conformation (I), the perpendicular, endo conformation (II), the cis,trans conformation (III), the perpendicular, exo conformation (IV), the trans,trans conformation (V), and the coplanar cis,cis,conformation (VI). Conformation I is predicted to be a stable intermediate, having both CH3 groups 20° oppositelytwisted out of the molecular plane. The order of stability of the planar conformations is V>III>I⪢VI. Utilizing the MINDO/2 calculated geometry, ab Initio calculations were done for all the six conformations. The ab Initio predicted order of stability is similar to that obtained with the MINDO/2 method. It is found that the ab Initio calculations yield rotation barriers that are too high, the MINDO/2 method yields values that are too low, compared with the experimentally determined barriers.
Molecular g-Values, Magnetic Susceptibility Anisotropics and Molecular Electric Quadrupole Moment of Methylenecyclobutenone
Authors: Czieslik W. , Sutter D. H.
Published: February 2015

The rotational Zeeman-effect of methylenecyclobutenone has been investigated giving the molecular (g-values: gaa = -0.0925 ± 0.0003, gbb = -0.0729 ±0.0003, gcc = -0.0086 ± 0.0003 and the magnetic susceptibility anisotropies:

2χaa-χbb-χcc= (23.0 ± 0.5) · 10-6 erg/G2 mole and

2χbb-χcc-χaa= (25.5 ± 0.5) · 10-6 erg/G2 mole.

These values correspond to the following molecular electric quadrupole moments given in units of 10-28 esu cm2: Qaa = 1.0±0.6, Qbb= 2.8±0.6 and Qcc = 3.8± 1.0. The experimental data of methylenecyclobutenone and similar strained ring molecules are compared with the results of INDO-calculations and values obtained from additivity rules for bond contributions.
Dielectric Behaviour of Glycine and Glycylglycine in Water in the Range of MHz
Authors: Sakellaridis P. U. , Karageorgopoulos E. K.
Published: February 2015

The dielectric behaviour of glycine and glycylglycine in aqueous solution was examined for low concentrations and in the range of MHz, at 273 to 313 K. Only the solutions of glycylglycine exhibit dielectric absorption in the range 7.05 × 108 to 1.6 × 109Hz. The dielectric absorption was attributed to the relaxation of glycylglycine molecules rotating with one or two molecules of water. The charge separation of the dipolar ion in solution was found to be 5.7 Å, the molecular radius 3 Å and the activation energy for the relaxation process 4 kcal/mole.
Volumetrie Anomalies in the Molten Salt Systems KI-TlI and TlCl-TlBr
Authors: Buckle E. R. , Tsaoussoglou P. E.
Published: February 2015

The densities of molten KI and TlI measured pyknometrically at various temperatures are slightly higher (0.1-0.2%) than the Archimedian values previously found by other workers. Molar volumes in the molten systems KI-TlI and TlCl-TlBr have also been measured pyknometrically. In the first system the relative excess volume is negative and in the second positive but as usual the melts expand on heating. The maximum deviations are about 2.5% and 1.5% respectively. In KI-TlI the excess volume-composition isotherm shows a double minimum at low temperatures, resembling the shape of the electrical conductance isotherms. The attribution of volumetric contractions to the relaxation of the thallium-ligand binding is supported by these results and by nmr evidence.
INDO- and CNDO-Approximated Molecular Orbital Calculations on the Spin-Spin Coupling Constants in Some 2-Substituted Oxetanes
Authors: Jokisaari Jukka
Published: February 2015

Spin-spin coupling constants between the methine proton in the oxetane ring and the phenyl protons and carbon nuclei have been calculated in different conformations in the INDO approximation for 2-phenyloxetane and 2-(4-fluorophenyl) oxetane, and in the CNDO approximation for 2-(2- chlorophenyl) oxetane and 2-(3-chlorophenyl) oxetane. In each case the finite perturbation method has been used.

In the case of 2-(2-chlorophenyl) oxetane a fairly high energy barrier for the rotation around the C-C bond between the rings is obtained, while in the other three cases the barrier is much lower. The calculations predict an equilibrium conformation in which the oxygen atom lies almost in the plane of the aromatic ring.

The calculated dipole moments of 2-(2-chlorophenyl) oxetane and 2-(3-chlorophenyl) oxetane vary significantly with conformation.
Energy Levels of Pt197
Authors: Alves S. Calzavara , Barros S. de , Gonçalves A.
Published: February 2015

Spectra of γ rays (higher than 0.3 MeV) following the β decay of Ir197 are measured with a Ge-Li detector (30 cm3). The existence of four new brandies to the Pt197 levels at 877.6 ± 0.3; 939.7±0.3; 1049.6±0.3; 1341.8±0.3 keV is proposed and lower limit log f t values are determined. Spin and parity (1/2, 3/2)+ are assigned to the ground state of Ir197.

A new transition of 299.5 ± 0.2 keV was observed following the Pt197 (80 min) decay.
Contrast of Kossel Patterns in Electron Diffraction
Authors: Fujimoto F. , Lehmpfuhl G.
Published: February 2015

Electron diffraction patterns from a Si crystal taken with a convergent beam of large angular aperture (Kossel pattern) are compared with the diffraction pattern taken with a hollow cone convergent electron beam. For thin crystals the patterns are complementary. This behaviour is discussed.
Energieübertragung zwischen gleich- und ungleichartigen Molekülen in LösungII. Experimente über Konzentrationsdepolarisation der Fluoreszenz / Energy Transfer Among Like and Unlike Molecules in Solution.II. Study of Concentration Depolarization of Fluorescence
Authors: Kawski A. , Kamiński J.
Published: February 2015

Radiationless energy transfer between like molecules (homotransfer) in thin rigid cellulose acetate films was studied by the concentration depolarization of the photoluminescence. The investigated substances are rhodamine B, 9-methylanthracene and 5-methyl-2-phenylindole. The experimental results have been compared with the “multi-shell model” of a luminescent centre. Good agreement was found with the equation which takes into account the excitation energy remigration. Concentration -depolarization measurements show that the critical distances R1, at which the probability of transfer of the excitation equals that of emission, are dependend on the excited wavelength. This is due to the failure of thermal relaxation of the exciting molecules with their environment.
Thermodynamic and Physical Behaviour of Binary Mixtures Involving Sulfolane Viscosity, Dielectric Constant and Solid + Liquid Phase Diagram of Mixtures of Dioxane + Sulfolane
Authors: Jannelli Liliana , Inglese Americo , Sacco Antonio , Ciani Pietro
Published: February 2015

Excess functions, H≠E, S≠E, G≠E for activation of viscous flow, as well as the dielectric constants of dioxane (1) - sulfolane (2) mixtures were determined: slight negative deviations from ideality were observed in both cases, with a minimum at x ≈ 0.5.

Solid-liquid equilibrium temperatures were also measured over the entire composition range. Solid solutions were observed in the region in which mesomorphic sulfolane is in equilibrium with the liquid.

Two phase diagrams may be drawn, in the region 0.33 ≦ x2 ≦ 0.98: one is of the simple eutectic type and the other exhibits two eutectis and a flat maximum corresponding to a 1:2 molecular compound, the occurrence of which is supposed to be caused by weak electrostatic attractions in a system of favorable crystal geometry rather than by bonding. A lessening of these interactions, with increasing temperature, would result in the liquid solution regular behaviour.