bluuebunny/crossref_metadata_2025_split huggingface dataset:
Aktivität des AgCl und Austauschstromdichte des Silbers in KAICI4- und LiCl-KCl-Schmelzen
Authors: Schulze K. , Hoff H. 
Published: February 2015

Abstract
The reduction of Ag+-ions (exchange current density io and charge transfer coefficient a) dissolved in an equimolar mixture of KC1-AlCl3 is studied by the double pulse method. By a comparison with the exchange current densities of silver in LiCl-KCl-melts the influence of the different structures of the electrolytes on the charge transfer is investigated. The great difference in the activity coefficient of silverchloride (γAgCl [LiCl-KCl] = 2.2 and γAgCl[KAlCl4] =82.3) is rather determined by the very limited solubility of the Cl--ions in the AlCl4
--sublattice than by the activity of the silver ion.
VUV Radiation by Dissociative Excitation of NH3
Authors: Böse N . , Sroka W. 
Published: February 2015

Abstract
The NH3 molecule is dissociated in a single step process into excited atoms and ions, which emit a radiation in the VUV. We have observed the Ly series and several lines of N I and N II. Only for Ly α we have found a structure in the shape of the excitation function.
Infrarotspektren des Kohlenmonoxids auf reduziertem Nickel-Natrium-X-Zeolith
Authors: Kölbel H. , Ralek M. 
Published: February 2015

Abstract
Die CO-Banden des an reduzierten Nickel-Natrium-X Zeolithen adsorbierten Kohlenmonoxids zeigen eine, im Vergleich zu anderen Nickelträgerkatalysatoren, anomal große Frequenzverschie-bung (200 cm -1) in der Abhängigkeit vom Bedeckungsgrad. Die Resultate werden im Rahmen der Vorstellungen über die Chemisorption des Kohlenmonoxids auf Metallen diskutiert.
Irrflug-Prozesse mit korrelierten Sprungwahrscheinlichkeiten I
Authors: Keller J.U. 
Published: February 2015

Abstract
Random walk processes often can serve as models for statistical processes like Brownian motion, heat conduction, diffusion and polymerisation of atoms and molecules. Using this model one generally assumes the jumps of the random walk particle to form a set of statistically independent events. In fact the jumps of the random walk particle are correlated to each other, so this assumption only holds as an approximation. In this paper a theory of the most simple type of the onedimensional random walk process with correlated jump-probabilities is developed. The results are demonstrated with two simple examples.
Messung der Magnetfelder am Kernort von 152 Sm und 154 Sm im Sm6Mn23 mit Hilfe der Spinpräzessionsmethode / Measurement of the local magnetic field, at the site of Sm in Sm6Mn23 by the spin precession method
Authors: Richter F. W. , Schütt J. 
Published: February 2015

Abstract
The magnetic field at the site of the nuclei 152 Sm and 154 Sm in a ferrimagnetic Sm6Mn23 probe has been measured by means of the perturbed angular correlation method after Coulomb excitation. The temperature dependence of the magnetic field has been investigated and compared with the results of macroscopic experiments. It can be concluded from the present work that the magnetic field Heff(T) at the site of the Sm nuclei is proportional to the macroscopic magnetisation J (T). We obtained a ferrimagnetic Curie Temperature of TC = 438(5) K in good aggreement with macroscopic values and Heff (T=0 K) = 1300(50) kOe.
Methoden zur Bestimmung von Wirkungsquerschnitten für Spinaustausch und Depolarisation indirekt optisch gepumpter Atome
Authors: Assfalg A. , Fricke J. , Haas J. , Lüscher E. 
Published: February 2015

Abstract
Two methods are described to derive cross sections for spin exchange and spin depolarization of an indirectly pumped alkali vapor with zero nuclear spin. Either pulsed or sinusoidally modulated radiofrequency can be used to destroy the polarization of the indirectly pumped (secondary) system, while the intensity of the transmitted pumping light is observed. Cross sections follow from the indirectly produced depolarization of the primary system i. e. from the change in pumping light transmission or from the phase angle between the rf modulation and the intensity oscillations of the transmitted light. The quality of the two methods is tested by deriving cross sections for spin exchange between Cs and Rb and for depolarization of Rb in Argon buffer gas.
Paramagnetische Elektronenresonanz (EPR) des Europiums in Cadmiumfluorid (CdF2: Eu 2+ ), weitere Untersuchungen / Electron Paramagnetic Resonance (EPR) of Europium in Cadmium - Fluoride (CdF2 : Eu2+), Further Details
Authors: Geist D. , Gerstenhauer E. , Rsckebrandt G. 
Published: February 2015

Abstract
This paper describes EPR measurements within the system CdF2 : Eu 2+ between 77 K and 300 K at 9 GHz and 35 GHz for B || [001]. The measurements enable a test of the formerly determined EPR parameters by the strict numerical solution of the eigenvalue problem including the hyper-fine terms. In particular “forbidden” transitions (ΔM = 2) also occur in a strict cubic crystalline field. An interpretation of the superhyperfine structure at 9 GHz and 35 GHz is compatible with the constants T|| = 6.26 MHz and T| = - 6.04 MHz of the interaction with the F ions of the 1 st shell.
Experimental Study of Low Energy e-O2 Collision Processes
Authors: Linder F. , Schmidt H. 
Published: February 2015

Abstract
Elastic scattering, vibrational excitation to v=1, 2, 3, 4 of the electronic ground state, and electronic excitation to the states a1Δ g and b1Σg
+ of O2 have been measured in a crossed beam apparatus for collision energies from nearly 0 eV to 4 eV. Differential and integral cross sections have been determined and calibrated on an absolute scale. From 15 vibrational levels of O2
-, which could be observed as resonances in the cross sections, the spectroscopic constants for the vibrational structure of O2
- have been derived: ωe = 135 meV and ωeχe = 1 meV. The cross sections for vibrational excitation have the order of 10-18 cm2. eV for the larger resonance peaks. Detailed cross sections have been listed in Table 1. The half width of the resonance can be estimated to Γ ≈ 0.5 meV, which corresponds to a lifetime tof 10-12 sec for the O2
- states. The angular dependence of pure resonance scattering is rather flat and not in accordance with the simplest theoretical model. An analysis of the angular dependence and of the rotational structure of the resonance in a somewhat extended model have been performed. - No electronically excited O2
-states could be detected in the energy range up to 3 eV.
Der Zeemann-Effekt im Rotationsspektrum von 2-Fluoropyridin
Authors: Sutter D. 
Published: February 2015

Abstract
The molecular Zeeman effect has been observed in the rotational spectrum of 2-fluoropyridine at magnetic fields close to 25000 G. The measured molecular g-values are gaa = -0.0880 ± 0.0007, gbb = - 0.0405 ±0.0006, gcc = + 0.0233 ±0.0006, and the two linearily independant components of the magnetic susceptibility anisotropy are 2 · χaa - χbb - χcc = 50.5 ± 1.6 and 2 · χbb - χcc - χaa - 53.8 ± 1.1 in units of 10-6 erg/G2 mol). The a-axis is close to the C-F-bond and the c-axis is perpendicular to the plane of the ring. A comparison of the gas-phase out-of-plane minus the average in-plane values for the susceptibilities of 2-fluoropyridine, pyridine, and fluorobenzene with the corresponding value for benzene in crystalline phase leads to the conclusion that the susceptibilities may change in the order of 10% when going from solid or liquid phase to the gasphase. A short description of the microwave-Zeeman spectrograph built at Kiel University is given. In the theoretical section expressions for the g-values and susceptibilities are derived which are more complete then those used up to now.
Über CdTe-Schichten und -Solarzellen
Authors: Kasse H. , Schneider G. 
Published: February 2015

Abstract
CdTe-Schichten wurden auf verschiedene Weise hergestellt und elektrische und photoelektrische Eigenschaften untersucht. Durch Verdampfen der Verbindung hergestellte Schichten zeigten den Hochvolt-Photovolt-Effekt, die höchsten Spannungen traten für In-dotierte Schichten auf. Durch gleichzeitiges Verdampfen der Komponenten Cd und Te (Dreitemperaturverfahren) erhaltene Schichten zeigten diesen Effekt nicht. Die günstigsten Herstellungsparameter wurden ermittelt. Durch gleichzeitiges Verdampfen von In oder Nachbehandlung der Schichten im Cd-Dampf wurden die elektrischen Widerstände durch Donatordotierung herabgesetzt. Gleichzeitige Dotierung mit Cd und In lieferte die niedrigsten Widerstände. Aus auf Molybdän-Substraten durch Komponentenver-dampfung erhaltenen CdTe-Schichten wurden durch Bildung von n-CdTe -p-Cu2Te-Heteroüber-gängen Solarzellen hergestellt. Dabei wurde der Einfluß verschiedener Dotierung mit Cd, In oder Cd + In untersucht.
On Boundary Conditions Method in the Kinetic Theory of Gases
Authors: Loyalka S. K. 
Published: February 2015

Abstract
It is shown that the work of Cercignani and Tironi on Maxwell's boundary conditions method can be improved in a simple and logical way. The technique for improvement is illustrated by a study of the linearized plane Couette flow problem and it is found that the proposed modification yields results that are identical with some highly accurate variational results.
Notizen: Interpretation of the Hopkinson Secondary Maximum in Terms of Parallel Pumping Theory
Authors: Markert H. 
Published: February 2015

Abstract
Some former measurements are reviewed concerning a secondary maximum occurring at the high-temperature side of the usual Hopkinson peak if a dc-magnetic field is superimposed parallel to the ac-field. Since, with regard to single domain particles embedded in a paramagnetic matrix, the measuring signal is proportional to the high-frequency losses, a secondary maximum indicates some kind of resonance phenomenon which obviously fulfills the geometrical conditions of parallel pumping experiments. It is shown that all other aspects of the experimental results also can be explained sufficiently if being interpreted in terms of parallel pumping theory.
Notizen: Determination of Cation Mobilities in Glasses by Direct Measurement of Drift Velocities (Moving Boundary)
Authors: Baucke F. G. K. 
Published: February 2015

Abstract
A method of concentration profile measurement of luminescent ions by ion sputtering has been applied to detect the boundary between alkali ions of glass wafers, which were contacted anodically by acid solution, and succeeding hydrogen ions after the application of an electric field. The transport number of lithium ions was found to be unity. Mobilities at 25 and 50 °C agree with data obtained from conductivity measurements. From the conductivity change during transport the mobility of succeeding hydrogen ions is also evaluated.
Die Molekülstruktur des Tetracyanmethans
Authors: Oberhammer Heinz 
Published: February 2015

Die Molekülstruktur des Tetracyanmethans in der Gasphase wurde mit Hilfe der Elektronen beugung bestimmt. Für die Bindungsabstände ergaben sich folgende Werte:
rC - C = 1,484 ± 0,005 Å und rC - N = 1,161 ± 0,003 Å.
Außerdem wurden die Bastansen-Morino-Shrinkage-Effekte für die ungebundenen interatomaren Abstände experimentell ermittelt
Characteristics of a Cresyl Violet Laser
Authors: Schmidt W. , Appt W. , Wittekindt N. 
Published: February 2015

Abstract
The properties of flashlamp-and laser-pumped cresyl violet lasers emitting between 620 and 710 nm were studied. In mixed cresyl violet-rhodamine 6G solutions, the excitation efficiency was found to be enhanced by more than a factor of two, the major part of the excitation energy being supplied by the rhodamine 6G fluorescence radiation.
Self-modelocking in a 3-component solution, containing cresyl violet, rhodamine 6G and a saturable absorber dye, was observed.
Protonen-Relaxation durch Triplett-Excitonen in Naphthalin-und Anthracen-Kristallen
Authors: Kolb H. , Wolf H. C . 
Published: February 2015

Abstract
The spin lattice relaxation time T1 of protons in naphthalene and anthracene crystals is decreased by the presence of metastable triplet excitons in these crystals. The exciton induced relaxation time T1, Exc is measured at 300 °K and 77 °K and at Larmor frequencies between 0.4 and 44 MHz. From the frequency dependence of T1, Exc the exciton-proton correlation time τc at the two temperatures is determined to 5.5 · 10 -12 sec and 4.1·10 -12 sec (±10%) in anthracene and 2.1·10-11 sec and 1·10 -11 sec in naphthalene, assuming scalar proton-electron interaction and statistical incoherent hopping motion of the excitons. The predictions of a theoretical model for exciton-migration are in satisfying agreement with the experimental results as far as experimental data for the parameters of that model are available.
Molekülstrahl-Resonanz-Messungen von Hyperfeinstruktur, Zeeman-und Stark-Effekt an TlCl-Isotopen in verschiedenen Schwingungszuständen / Molecular Beam Resonance Measurements of Hyperfine Structure, Zeeman- and Stark-Effect of TICl-lsotopes in Different Vibrational States
Authors: Ley R. , Schauer W. 
Published: February 2015

Abstract
Hyperfine structure, Stark effect and Zeeman effect of the TlCl molecule have been measured with a molecular beam apparatus using electric four poles as deflecting fields and a homogeneous electric field parallel to a superimposed magnetic field in the transition region. Electric dipole transitions were induced between the hyperfine structure levels of the first rotational state J = 1 in both strong and weak external field.
The following quantities could be evaluated from the spectra: the electric dipole moment µel and the magnetic rotational dipole moment µJ of the molecule, the nuclear spin-rotational interactions c1 and c2

, the scalar and tensor part of the nuclear dipole-dipole interaction dS and dT, the quadrupole coupling constant e q Q of the Cl nucleus, the anisotropy of the magnetic susceptibility ξ⊥− ξ∥ , the anisotropy of the magnetic shielding of the external magnetic field at the position of both nuclei (σ⊥- σ∥)1 and (σ⊥- σ∥)2, the magnetic moment of the Cl nucleus multiplied by the scalar part of the magnetic shielding tensor µ2 · (1 - σS)2. For the most abundant isotop 205Tl35Cl the vibrational dependence of most of these quantities was measured in the vibrational states v =0, 1, 2, 3. Isotopic effects for 203Tl35Cl, 205Tl37Cl and 203Tl37Cl were investigated in the ground vibrational state. In addition the vibrational dependence of the electric dipole moment was measured for all isotopic species.
It is pointed out that the usual connections between (σ⊥- σ∥)1,2 and c1,2 and between ξ⊥− ξ∥ and µJ do not hold when the excited electronic states of the molecule obey Hund’s coupling case c, which occurs most probably in TlCl.
Die Polarisation der σ-Bindungen im Azulen
Authors: Seydewitz H. , Schmid E.D. 
Published: February 2015

Abstract
On the basis of a simple MO-approach a model to interprete the IR-absorption intensity of the aromatic CH-stretching vibration is developed. Accordingly the gradient of the CH-bond moment is a linear function of the ionicity of the CH-bond.
Eight azulenes, which were deuterated at various specified positions, were synthetisized and out of their IR-spectra the gradients of the CH-bond moment at all positions of azulene could be determined. From these experimental data it is concluded, that in relation to benzene the electrons of the CH-bonds in azulene are displaced towards the C-atom at positions with high and towards the H-atom at positions with low π-electron density.
Such a polarisation of the CH-bonds in azulene is confirmed, although only qualitatively, by the ionicities of the CH-bonds calculated by the CNDO/2-method and is also in accordance with other experimental observations such as bond lengths and angles, C13H-coupling constants, and the frequencies of the CH-stretching vibrations.
It is demonstrated that experiment and calculation fail to correlate quantitatively due to in-adequacies inherent in the CNDO/2-method.
On the Ratio L12/L21 For n = 2 Eigenvalue Problems: An Empirical Constraint For The Calculation of Force Constants (Extended L Matrix Approximation)
Authors: Müller A. , Mohan N. , Heidborn U. 
Published: February 2015

Abstract
The variation of the ratio L12/L21 (where Lij refers to the element of the L matrix) as a function of the mass coupling term T=G12/|G|1/2 has been studied for molecules of the type XY4(Td), XY3(D3h) and XY2C2v) using the exact force field data. In the case of the XY4 and XY3 type molecules, the ratio L12/L21 is nearly independent of the mass coupling and in the case of the XY2 type, it shows a nearly linear dependence on T. The force constants have been evaluated using an empirically determined constraint for L12/L21. The values are generally in good agreement with the exact ones. In all cases except VCl4 the exact interaction term of the F matrix is in agreement with the sign rule of Müller et al.
Thermotransport of Noble Metal Impurities in Lead
Authors: Sullivan George A. , Larsson Sune , Thernquist Per T. 
Published: February 2015

Abstract
Steady-state distributions of Au, Ag and Cu tracers in Pb wafers subjected to temperature gradients have been determined. The effective heats of transport were + 5.8 ± 1.1 for Ag, - 0.5 ± 0.3 for Au, and of the order of + 35 for Cu (all in kcal/mole, positive values denoting the impurity migrating to the cold side of the Pb wafer). No significant temperature dependence of the heats of transport could be detected. The results are difficult to reconcile with existing theories of the intrinsic and electronic contribution to the heat of transport.
The (Tl,Na,Li)NO3, (Tl,Na,Rb)NO3, (Tl,Na,Cs)NO3 Ternary Systems
Authors: Cingolani A . , Berchiesi M. A . , Piantoni G. , Leonesi D. 
Published: February 2015

Abstract
Solid-liquid equilibria were studied by a visual method in order to draw the polythermal pro-jections of the (Tl, Na, Li)NO3, (Tl, Na, Rb)NO3 , and (Tl, Na, Cs)NO3 ternary systems. The seven pertinent binaries are also discussed and data concerning the invariant points and crystallization regions are given.
Liquid-Crystalline Curvature Electricity: The Bending Mode of MBBA
Authors: Schmidt D. , Schadt M. , Helfrich W. 
Published: February 2015

Abstract
Measurements are reported which show that the room-temperature nematic MBBA can be deformed by means of curvature electricity if it is contained in a thin sandwich cell with the electric field parallel and the unique axis normal to the bounding walls. Meyer's coefficient e33 was determined to be 4 · 10-5 dyne1/2 at room temperature; and its sign was found to be positive.
Reaktivitätsabschätzungen an substituierten Phenolen mit Hilfe semiempirischer MO-Methoden / Estimations of Reactivity on Substituted Phenols by Semiempirical MO-methods
Authors: Sterk H. , Hopels W. 
Published: February 2015

Abstract
The electron density distributions for a series of phenol derivatives in the ground state are calculated by HMO, EHT, CNDO, and MINDO/2 methods. The values thus obtained provide an explanation for the point of attack in electrophilic substitution reactions, a feature of particular interest being the displacement of a substituent by the attacking agent. The results of the applied MO-methods are compared and discussed.
Der Einfluß tiefer Temperaturen auf die Strahlenschädigung von organischen Kristallen durch 100 keV-Elektronen / The Influence of Very Low Temperature on the Radiation Damage of Organic Crystals Irradiated by 100 keV-Electrons
Authors: Siegel G. 
Published: February 2015

Abstract
The radiation damage of electron irradiated organic compounds (paraffin, tetracene) was investigated in the temperature range 300 - 4 K. The radiation damage was measured by the decrease of diffraction intensities or the contrast of extinction contours. The damage of the crystals at 4 K required considerable higher electron doses than at 300 K. This result is explained as follows: The total radiation damage proceeds by two steps: 1) By primary radiation damage - excitation of energy levels with subsequent dissociation - which is almost temperature independent, 2) by secondary radiation damage - diffusion of molecular fragments - which decreases strongly with decreasing temperature.
Abtragraten und spezifische Energieverluste von 5,6 keV-Edelgasionen an Kieselglas
Authors: Bach H 
Published: February 2015

Abstract
Sputtering yields and damage depths caused in SiO2 glass and thin SiO2 glass-layers by Ne-, Ar-, and Xe-ions of 5.6 keV are reported for the angles of incidence 0°, 45°, and 65°. Nuclear specific energy losses are derived from the mean damage depths. The results are compared with the theory of Brandt and Laubert predicting proportionality of sputtering yield and nuclear specific energy loss. For Ar- and Xe-ions satisfactory agreement is found.
Comparison of measured sputtering yields with yields calculated from experimental specific energy losses allows for corrections of the mean damage depths as obtained with the luminescence method applied earlier.
Low-Energy Electron Diffraction Amplitudes for a "Bare-Substrate" Model
Authors: McRae E. G. 
Published: February 2015

Abstract
A theory of low-energy electron diffraction (LEED) amplitudes is developed for a model in which the crystal surface is represented by a step-function termination of the bulk crystal potential ("bare-substrate" model). The crystal is considered to be centro-symmetric and it is assumed that either the crystal has a two-fold axis of rotation normal to the surface or the primay beam is normally incident on the surface. The origin of coordinates is taken to lie at a center of symmetry of the substrate crystal. The diffraction amplitude is considered as a function of complex electron energy. For a real potential it is shown to have the following properties:
1. The imaginary part of the amplitude vanishes at each branch point of the amplitude function;
2. There are certain segments of the real-energy axis, called "inactive" segments, throughout which the imaginary part of the amplitude vanishes approximately.
The theoretical results are illustrated by a numerical example. It is suggested that the diffraction amplitude can be represented by a simple expression that has the correct functional form and that satisfies the appropriate dispersion relation. One such expression is proposed and discussed in comparison with exact computational results.
Calculation of Reflected Intensities for Medium and High Energy Electron Diffraction
Authors: Moon A.R. 
Published: February 2015

Abstract
The Bethe theory of electron diffraction is used to calculate reflection electron diffraction intensities for medium and high energy electrons. A generalized Hill's determinant method is used for the numerical calculations instead of the more common but slower matrix-eigenvalue technique. Results of a "systematics" calculation of the specular intensity as a function of incident angle are compared with some experimental values for the Si (111) surface. The application of the Bethe theory to crystals where the surface structure differs from the bulk is also considered.
Berücksichtigung der Gitterperiodizität bei der Elektron-Plasmon-Streuung. I / Consideration of Lattice Periodicity at the Electron Plasmon Scattering. 1.
Authors: Münchmeyer W 
Published: February 2015

Abstract
The scattering of electrons by solid-state plasmons is investigated, the system of valence electrons being treated with Green's function method. The lattice periodicity is taken into account for the wave field of the incident electrons as well as for the plasma oscillations of the valence electrons. Scattering processes which contain a reciprocal-lattice vector in the momentum balance appear in addition to the usual inelastic small-angle scattering. Their influence upon the imaginary part of the complex scattering potential is discussed. In a following paper, the reason for the additional scattering processes will be given in terms of the form of the Fermi surface of the solid.