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Volume 33 Issue 12

Issue of Zeitschrift für Naturforschung A

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Open Access June 2, 2014

On the Evaluation of Transport Collision Frequencies I. The Integration of Empirical Data

Ulrich Weinert, Klaus-Achim Kratzsch, Heinz-Rüdiger Oberhage

Page range: 1423-1427

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Abstract

The computation of the transport collision frequencies is discussed, provided the transfer cross sections are given at least for a discrete set of relative kinetic energies. Numerical investigations show that the most satisfying results are achieved by the use of rational interpolation of the transfer cross sections.

Open Access June 2, 2014

On the Evaluation of Transport Collision Frequencies II. An Approximating Method to Express the Temperature Dependence

Ulrich Weinert

Page range: 1428-1431

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Abstract

The temperature dependence of the transport collision frequencies is discussed, provided they are given for one special reference temperature. An approximative procedure to express this dependence is elaborated using the definition of the transport collision frequencies as expansion coefficients.

Open Access June 2, 2014

General Formulation of the (111,1̄11) Neutron Three Beam Case

W. Treimer

Page range: 1432-1435

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Abstract

A formalism developed in a previous paper [1] is now applied in a general way to the special three beam case (111, 1̄11). The restriction for the incoming wave to be located in the symmetry plane is abolished. The individual behavior of the dispersion surfaces and reflection curves are determined and discussed.

Open Access June 2, 2014

Tables of Radiative Corrections to Pion Nucleon and Nucleon-Nucleon Scattering

E. Borie

Page range: 1436-1446

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Abstract

The importance of radiative corrections to hadron scattering is discussed, and the relevant formulas presented in a somewhat simpler form than has been given previously. Tables are given to enable the experimentalist to estimate the numerical importance of the corrections, or evaluate them by interpolation.

Open Access June 2, 2014

Leistungseinkopplung in ein Plasma erhöhter Elektronentemperatur bei der unteren Hybridresonanz

G. Glomski, B. Heinrich, H. Schlüter

Page range: 1447-1451

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Abstract

Previous investigations of lower hybrid resonant coupling to plasmas of low collision frequencies and elevated electron temperature are extended to cover a range of some mW to 1500 W of reactive power. Though resonant behaviour is observed throughout, the efficiency of power transfer is lowered when a threshold at about 1 Watt of reactive power is surpassed. Moreover there is a limited decrease of electron density. For high powers saturation in the drop of transfer efficiency is observed.

Open Access June 2, 2014

Neutron Slowing Down with Inelastic Scattering

S. A. El Wakil, H. M. Machali, E. A. Saad

Page range: 1452-1454

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Abstract

The neutron slowing-down equation in an infinite homogeneous medium with isotropic scattering is solved. The slowing-down kernel is separated into an elastic and an inelastic part. The collision density is expressed in terms of Green’s function of the elastic scattering only. The Greuling- Goertzel (G-G) approximation is used for the elastic scattering kernel, while Volkin’s model is used for the inelastic one. A differential-difference equation for a one-level excited state is solved by Laplace transform. Discussion of the poles obtained in the Laplace inverse shows that there are forbidden zones in which there is no solution. Numerical calculations of the collision density in Fes 6 at 922 and 865 kev levels are performed, which give the same behaviour as obtained by Corngold. The average slowing-down time calculated with our approach agrees with Williams’s result in the asymptotic solution.

Open Access June 2, 2014

Theoretical Study of Time Correlation Functions in a Discrete Chaotic Process

Hirokazu Fujisaka, Tomoji Yamada

Page range: 1455-1460

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Abstract

One-dimensional discrete chaotic processes are studied from a statistical-dynamical point of view. A set of equations which describe the behavior of the time correlation functions is derived with the aid of Mori’s projector formalism. A condition under which a process is Markoffian is obtained, and an approximate method is developed for a non-Markoffian process. As an illustration, a time correlation function for a simple system is calculated and the comparison with results of computer simulations is made. The relation between the instability of a trajectory and the characteristic time of chaotic motions is also discussed.

Open Access June 2, 2014

Interaction Potentials of Hg-Ar from Temperature Dependent Absorption Spectra

H. C. Petzold, W. Behmenburg

Page range: 1461-1468

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Abstract

The temperature dependence of the absorption spectrum k(v̄) of Hg-Ar-mixtures in the range 30-1000 cm -1 about the center of the Hg-line at v̄ 0 = 39425 cm -1 (λ 0 = 2536.5 Å) has been investigated in the temperature interval 473 -1273 K. The measurements were carried out at number densities 1.0 x 10 17 -9.1 X 10 18 cm -3 for Hg and 9.4 x 10 18 -9.7 x 10 18 cm -3 for Ar. Potentials for the Hg-Ar-system in the thermal energy range originating from the Hg-states 6 1 S 0 and 6 3 P 1 have been deduced from the data. It turned out that they differ considerably from Lennard-Jones-functions. By comparison of the observed spectra with calculations on the basis of quantummechanical theory of collisional line broadening it is concluded that transitions from free translational states of Hg-Ar-pairs as well as bound and quasi-bound vibrational states of the Hg-Ar-molecule contribute to the formation of the satellite structure on the short wavelength side of the Hg-line.

Open Access June 2, 2014

Effect of Conductivity on Magneto-Gravitational Instability and Suspended Particles

R. K. Chhajlani, P. Vashistha, S. C. Bhand

Page range: 1469-1471

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Abstract

The self gravitational instability of an infinite homogeneous magnetized gas-particle medium in the presence of suspended particles is investigated. The conductivity of the medium is assumed to be finite. The dispersion relation is obtained for such a medium. It is found that in the presence of suspended particles a sufficient condition of instability is obtained by Jeans’ criterion for a self gravitating magnetized conducting gas-particle medium.

Open Access June 2, 2014

New Aspects on Melting and Annealing Behaviour of Polymers

J. Haase, S. Köhler, R. Hosemann

Page range: 1472-1483

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Abstract

Poly( 1-butene) (PB) crystallizes from the melt in a metastable modification II (mod. II) which slowly transforms into the stable modification I (mod. I). X-ray wide angle (WAXS) measurements show that in mod. I the size of the microparacrystallites (mPC’s) in chain direction, D̅ 012 , the polydispersity g D of the size distribution in this direction, the lateral size D̅ 110 and the paracrystalline g 110 -value do not change upon annealing at temperatures up to the melting point. In mod. II, however, the sizes D̅ 012 and D̅ 110 increase with rising annealing temperature T ann . At a certain T ann and beyond a sufficient annealing time t ann the size D̅ 012 shows a logarithmic increase with t ann whereas D̅ 110 stays constant. Measuring melting points T m of mod. I-samples, we found a linear relationship between T m and 1/D̅ 012 according to the Thomson equation resulting in a melting point for an infinite crystal of T m ∞ (mod. I) = 139 °C and a mean surface free energy of σ̅ e ′̅ (mod. I) = 47 ergs/cm 2 . T m versus 1/D̅ 012 for mod. II is linear only for high D̅ 012 -values yielding Tm ∞ (mod. II) = 130 °C and σ̅ e ′̅ (mod. II) = 29 ergs/cm 2 . However, a partially molten and afterwards quenched sample of mod. I with small mPC’s shows a mod. II-peak which fits the straight line extrapolated from the large D̅ 012 -values. The DTA curves of mod. I-samples shift to higher temperatures and narrow after annealing although the crystallite sizes and size distributions remain as well as the paracrystalline distortions the same. X-ray and DTA measurements eliminate therefore surface premelting and selective melting of thinner and more distorted lamellae in mod. I. Upon annealing this modification, σ̅ e ′̅ decreases from 47 ergs/cm 2 to 15 ergs/cm 2 and the distribution of σ e ′ narrows. The latter determines predominantly the shape of the DTA curve. The Thomson equation therefore, applied to different samples links only the average crystallite size and the mean surface free energy with the melting point. In mod. I partial melting occurs independent of D̅ 012 and starts mainly at those mPC’s which have exposed surfaces with high σ e ′. At the beginning only single mPC’s or single lamellae melt, but no bundles of lamellae. The logarithmic increase of D̅ 012 in mod. II with t ann can be explained according to Hosemann’s model of “lateral melting” also by a partial melting of mPC’s with unprotected lateral surfaces and by a consecutive solid state diffusion of their chainsegments into the two mPC’s adjacent in chain direction, increasing the averaged sizes of the long period and the lamellae thickness.

Open Access June 2, 2014

Atomic Hydrogen in the Mineral Brasilianite NaAl₃(PO₄)₂(OH)₄

Fritz Hill, Gerhard Lehmann

Page range: 1484-1486

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Abstract

EPR parameters for atomic hydrogen in three nonequivalent special positions at the twofold axis of the monoclinic structure of brazilianite, formed by X-ray irradiation at room temperature, are reported. The g-factors are practically isotropic and close to the free electron value, but the hyperfine splittings exhibit considerable anisotropy. One of the centers shows an additional doublet splitting, most likely due to hyperfine interaction with the proton of one of the OH groups. These hydrogen atoms have the highest thermal stability yet reported. With repeated thermal destruction and formation by ionizing radiation one of the centers is rapidly depleted. Thus they must be formed at defect sites, not from the undisturbed OH groups, and trapped near the sites of formation and their thermal destruction must at least in part be irreversible. Possible defects for their formation are discussed.

Open Access June 2, 2014

“Constant-Volume Alloy” Formulation of Enthalpy of Mixing for Metallic Systems

H. R. Leribaux, P. J. Desre

Page range: 1487-1492

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Abstract

We present an exact statistical thermodynamic expression for the partial enthalpy of mixing for metals which avoids the problems of evaluating the large internal energy of the pure metals from the plasma state. This method is applied to the homovalent alloys Al-Ga, Al-In and Al-Tl. The results show clearly the tendency towards a critical mixing point in these systems when using a pseudopotential theory for these metals. An estimate for the critical point of the Al-Tl system and reasonably correct values for the partial enthalpies at infinite dilution are obtained.

Open Access June 2, 2014

Microwave Transient Phenomena of Symmetric Top Molecules. An Extended Bloch Type Description

H. Mäder, H. Bomsdorf

Page range: 1493-1497

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Abstract

The Bloch equations for the macroscopic polarization components P r and P i and the population difference ⊿N of a two-level system are derived with inclusion of diagonal elements of the electric dipole moment operator. The influence of such elements on the solutions is discussed. The effect of Stark-switching technique on the observed transient emission signal is considered.

Open Access June 2, 2014

Microwave Spectra of Dimethylether (CH₃)₂O and (CD₃)₂O in Excited Torsional States

H. Lutz, H. Dreizler

Page range: 1498-1510

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Abstract

The rotational spectra of the torsional excited states v̅ n = 1 1 ,1 2 ,2 1 , 2 2 , 2 3 have been measured and assigned. The torsional fine structure was used to determine the coefficients V 3 and V' 12 of the hindering potential. For (CH 3 ) 2 O : V 3 = 2618 ± 4 cal/mole, V'12 = 18 ± 8 cal/mole, for (CD 3 ) 2 O : V 3 = 2572 ± 6 cal/mole, V' 12 = 29 ± 12 cal/mole, V 12 was correlated to V 3 .

Open Access June 2, 2014

The Complete Substitution Structure of 1,2,5-Thiadiazole

Otto L. Stiefvater

Page range: 1511-1517

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Abstract

Double Resonance M odulation (DRM) microwave spectroscopy has been used to determine the complete substitution structures of 1,2,5-thiadiazole and 3,4-d 2 -1,2,5-thiadiazole. The 34 S-, 13 C- and 15 N-species o f these two “parent” molecules were studied in natural abundance. The structure parameters o f the two parent forms agree to within ± 0.0005 Å and ± 0.02° with the following averaged values: Distances (in Å) S - N = 1.6296 C = N = 1.3270 C - C = 1.4167 C - H = 1.0805 Angles (in degrees) NSN = 99.44 SNC = 106.51 NCC = 113.77 CCH = 126.27 The new data confirm the earlier work on this substance, but the precision o f the structure parameters is improved by a factor of ~ 10. The apparent C-C bond length in the normal species is found to differ by ~ 0.001 A from that in the 3,4-d 2 -species. Vibrational contributions (⊿I vib ) to the effective changes of the moments o f inertia are determined for the sulphur atom and the near-axis nitrogen atoms as ⊿I vib (S) = - 0.0017 μÅ 2 and ⊿I vib (N) = - 0.0035 μÅ 2 . Energy transfer through collisions has been exploited to overcome traditional difficulties in the identification o f high-J Q-branch transitions o f rare isotopic forms.

Open Access June 2, 2014

The Quadrupole Coupling Constants of 1,2,5-Thiadiazole

Otto L. Stiefvater

Page range: 1518-1524

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Abstract

The nitrogen quadrupole coupling constants along the inertial axes o f 1,2,5-thiadiazole are determined as X aa = 0.90 ± 0.01 MHz, X bb = - 3.13 ± 0.06 MHz, X cc = X (⟂) = 2.22 ± 0.06 MHz, and Dobyns and Pierce’s value for the dipole m om ent is confirmed as μ = μ a = 1-58 ± 0.02D. (The uncertainties are three standard deviations.) Comparison o f these data with their counterparts in related compounds leads to speculation that the direction of the main field gradient in the molecular plane deviates from the SNC bisector towards the sulphur atom by Ɵ ~ 5° - 10°. From this assum ption the principal in-plane coupling constants are X radial = X zz ~ - 3.82 MHz and X tangential = X xx ~ 1.60 MHz, with uncertainties of ± 0.20 MHz due to a probable error of ± 2° in the assumed direction (Ɵ = 8°) of the z-axis o f the field gradient tensor.

Open Access June 2, 2014

The Rotational Zeeman Effect of Molecules with Low Barrier Internal Rotation. II. Derivation of the Effective Rotorsional Hamiltonian

L. Engelbrecht, D .H . Sutter

Page range: 1525-1545

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Abstract

Theoretical expressions for the molecular parameters in the effective rotorsional Hamiltonian in a strong magnetic field are derived from a second order perturbation treatment within the electronic states which was adapted to the presence of a large am plitude internal motion. The technique developed m ay be o f use also in other applications where it should be necessary to go beyond the Born-Oppenheimer approximation. By use o f the theoretical expressions it is now possible to use experimentally determined Zeeman data to derive “experimental values” for the molecular electric quadrupole moments, the paramagnetic susceptibilities, the second m om ents o f the electron charge distribution, and the sign of the molecular electric dipole moment also for low barrier molecules.

Open Access June 2, 2014

Two-Photon Ionization of Polyatomic Molecules in a Mass Spectrometer

U. Boesl, H. J. Neusser, E. W. Schlag

Page range: 1546-1548

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Abstract

Two-photon ionization of benzene molecules in a mass spectrometer is performed with a tunable frequency-doubled dye laser. The nonlinear ionization is resonantly enhanced by real intermediate rovibronic levels in the S 1 state of the molecule. Our results show that stepwise multi-photon ionization is a very selective and versatile ionization source for a mass spectrometer.

Open Access June 2, 2014

A Cluster Expansion Formalism for Direct Calculation of Ionisation Potential and Excitation Energy of Many Electron Systems Using H-F Ground State as Vacuum

D. Mukherjee, A. Mukhopadhyay, R. K. Moitra

Page range: 1549-1551

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Abstract

In this note, the authors’ recently developed non-perturbative open-shell theory is adapted for direct calculation o f ionisation potential and excitation energy of m any-electron systems. The H -F ground state is used as the “vacuum ” or “ core” in order to achieve a transparent separation o f the ground state energy. An application to a simple 4 π-electron system is discussed as an illustration o f the workability of the theory.

Open Access June 2, 2014

Nachweis von BrO₂ im Belousov-Zhabotinskii-System

H. D. Försterling, H. Schreiber, W. Zittlau

Page range: 1552-1556

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Abstract

From the analysis of the absorbance of an oscillating Belousov-Zhabotinskii-system (initial concentrations 0.1 m malonic acid, 0.1 m bromate and 10 -4 m Ce 4+ in 2n sulfuric acid) it is concluded that the absorbance in the spectral region from 400 to 600 nm is mainly due to the oscillations of Ce 4+ and BrO 2 , and that no Br 2 is to be detected. The maximum concentrations of Ce 4+ and BrO 2 during the oscillations are in the order of 10 -5 m and 10 -7 m respectively. The results are in accordance with theoretical considerations basing on the mechanism of Field, Körös and Noyes.

Open Access June 2, 2014

Monte Carlo Simulation of the Interfaces Liquid-Crystal and Liquid-Rigid Wall

B. Borštnik, A. Ažman

Page range: 1557-1561

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Abstract

The structure of liquids at liquid-crystal and liquid-rigid wall interfaces was studied by the Monte Carlo method on systems consisting of either 128 Lennard-Jones atom s or 128 hard spheres. The resulting density profile can serve as a reference for the approximative methods based on the BGYB hierarchy of integral equations. The pair correlation function close to the rigid wall is found to deviate appreciably from the bulk liquid pair correlation function. The maxima and minima of g(r) are more pronounced in the first two layers of atom s close to the rigid wall.

Open Access June 2, 2014

Dissection of ¹³C/¹²C Isotope Effects on the Cyanoacetylene Partition Function

P. Bopp, K. Heinzinger, M. Wolfsberg

Page range: 1562-1574

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Abstract

13 C/ 12 C reduced isotopic partition function ratios for the three singly 13 C substituted cyanoacetylenes are calculated and are used to evaluate the thermodynamic equilibrium constants among these species. A perturbation theory method is employed to dissect both the partition function ratios and also the equilibrium constants in order to gain a better understanding of isotope effects.

Open Access June 2, 2014

Application of the Model Microfield Method to Stark Profiles of Alkali Metal Resonance Lines

A. Mazure, G. Nollez

Page range: 1575-1580

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Abstract

Stark widths and shifts of alkali metal resonance lines are calculated by the model microfield method (MMM). The im pact results of Griem for the prevailing electronic broadening are recovered by the unified MMM. Both theories are in close agreement with recent experimental results. It is shown further that the shift values are very sensitive to the line strength values of the involved transitions. The reliability of the experimentally observed regularities through the alkali sequence is next discussed. On the basis of the MMM results these regularities can be understood in term s of the line strengths and frequencies of transitions from the main levels actually involved.

Open Access June 2, 2014

Some Properties of a Quartic Potential with a Finite Binding Energy

R. N. Kesarwani, Y. P. Varshni

Page range: 1581-1587

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Abstract

A potential energy function is proposed which exhibits a quartic dependence on (r - r e ), where re is the equilibrium interparticle distance, in the neighbourhood of r e , and has a finite binding energy. To study the pattern of the eigenvalues, the WKBJ method is applied to the third order, and the relevant integrals are evaluated analytically. Results are shown graphically for a few sets of parameters. The number of vibrational states that the potential can support is determined for a range of values of the parameters. Some suggestions as to the possible applications of the proposed potential are also made.

Open Access June 2, 2014

Uranisotopentreiinung mit einem Gegenstromwirbelrohr

E. W. Becker, P. Bley, W. Ehrfeld, H. Lenné

Page range: 1588-1589

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Abstract

Uranium isotope separation in countercurrent vortex tubes has been investigated experimentally using a mixture of uranium hexafluoride and a light auxiliary gas as the feed gas. A minimum value of 7000 kW h/SW U was obtained for the ideal specific energy consumption which is higher by a factor of 2.7 than the corresponding value of the separation nozzle. Further specific expenditures for this type of vortex tube, e.g. the suction volume and the length of separator required per unit separative work have been found to be also unfavorably high in view of a commercial application.

Open Access June 2, 2014

Ratios of Isotopic Frequencies Using HLFS Method

T. R. Ananthakrishnan

Page range: 1590-1591

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Abstract

Simple expressions involving elements of the kinetic energy matrix are obtained for the ratios of isotopic frequencies in the case of vibrational species, of order two and three, associated with small molecules by employing the high and low frequency separation method and the product rule. The applicability of the method is indicated.

Open Access June 2, 2014

Measurement of Fluorescence Lifetimes of Coumarin Laser Dyes with a Mode-Locked Krypton Ion Laser

J. H. Richardson, L. L. Steinmetz, S. B. Deutscher, W. A. Bookless, W. L. Schmelzinger

Page range: 1592-1593

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Abstract

The fluorescence lifetime of four coumarin laser dyes (C-7, C-30, C-102, and C-120) were measured in three different solvents (methanol, ethanol and water) a t dilute and lasing concentrations. The lifetime generally decreases for the more hydrophobic dyes as the solvent polarity increases. There is little change with concentration due to the large Stokes shift.

Open Access June 2, 2014

The Light Guide Effect of Planar Lipid Bilayers and Its Application to Bilayer Spectroscopy

H. P. Braun, M. E. Michel-Beyerle

Page range: 1594-1596

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Abstract

The light guide properties of planar lipid bilayers offer a novel approach to bilayer spectroscopy. Potential applications are outlined.

Open Access June 2, 2014

Quadrupole Splitting of Vanadium-51 N.M.R. Signals in Nematic Phases

Dieter Rehder, Kurt Paulsen, Hans Lechert

Page range: 1597-1598

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Abstract

The 51 V n.m .r. spectra of vanadyl esters dissolved in nematic liquids show a seven line system which is due to a first order quadrupole interaction. Quadrupole splittings vary from 3.6 to 19.3 kHz.

Open Access June 2, 2014

Detection of a-Phase Precipitates in Decomposing NiH₆ by Bitter Powder Pattern

D. Jonitz, H. J. Bauer

Page range: 1599-1600

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Abstract

The application of a decoration technique basing on the settlement of iron single domain particles made it possible to identify directly small ferromagnetic a-phase particles in early states of decay of nickel hydride. In crystals of different orientation of the surface the shape and orientation of particles could be defined.

Open Access June 2, 2014

Sachverzeichnis

Page range: 1601-1608

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Open Access June 2, 2014

Autorenverzeichnis

Page range: 1609-1611

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About this journal

Objective
A Journal of Physical Sciences: Zeitschrift für Naturforschung A (ZNA) is an international scientific journal which publishes original research papers from all areas of experimental and theoretical physics. Authors are encouraged to pay particular attention to a clear exposition of their respective subject, addressing a wide readership. In accordance with the name of our journal, which means “Journal for Natural Sciences”, manuscripts submitted to ZNA should have a tangible connection to actual physical phenomena. In particular, we welcome experiment-oriented contributions.

Manuscripts considered for publication in A Journal of Physical Sciences: Zeitschrift für Naturforschung A undergo high-level refereeing. Mere formal correctness of a paper is not sufficient for its acceptance. Moreover, articles reporting a merely marginal extension of already existing knowledge are considered unsatisfactory. Instead, the key quality a publication in A Journal of Physical Sciences: Zeitschrift für Naturforschung A should possess is that it makes a genuine contribution to the advancement of its topic.

Topics

Atomic, Molecular & Optical Physics
Chemical Physics
Dynamical Systems & Nonlinear Phenomena
Fundamental Concepts of Physical Sciences
Gravitation & Cosmology
Hydrodynamics & Plasma Physics
Nuclear Physics & Particle Physics
Quantum Field Theory
Solid State Physics & Materials Science
Thermodynamics & Statistical Physics
Article formats
Original research articles, research notes, letters and review articles from all areas of theoretical and experimental physics

Information on submission process

Volume 33 Issue 12

Issue of Zeitschrift für Naturforschung A

On the Evaluation of Transport Collision Frequencies I. The Integration of Empirical Data

Abstract

On the Evaluation of Transport Collision Frequencies II. An Approximating Method to Express the Temperature Dependence

Abstract

General Formulation of the (111,1̄11) Neutron Three Beam Case

Abstract

Tables of Radiative Corrections to Pion Nucleon and Nucleon-Nucleon Scattering

Abstract

Leistungseinkopplung in ein Plasma erhöhter Elektronentemperatur bei der unteren Hybridresonanz

Abstract

Neutron Slowing Down with Inelastic Scattering

Abstract

Theoretical Study of Time Correlation Functions in a Discrete Chaotic Process

Abstract

Interaction Potentials of Hg-Ar from Temperature Dependent Absorption Spectra

Abstract

Effect of Conductivity on Magneto-Gravitational Instability and Suspended Particles

Abstract

New Aspects on Melting and Annealing Behaviour of Polymers

Abstract

Atomic Hydrogen in the Mineral Brasilianite NaAl3(PO4)2(OH)4

Abstract

“Constant-Volume Alloy” Formulation of Enthalpy of Mixing for Metallic Systems

Abstract

Microwave Transient Phenomena of Symmetric Top Molecules. An Extended Bloch Type Description

Abstract

Microwave Spectra of Dimethylether (CH3)2O and (CD3)2O in Excited Torsional States

Abstract

The Complete Substitution Structure of 1,2,5-Thiadiazole

Abstract

The Quadrupole Coupling Constants of 1,2,5-Thiadiazole

Abstract

The Rotational Zeeman Effect of Molecules with Low Barrier Internal Rotation. II. Derivation of the Effective Rotorsional Hamiltonian

Abstract

Two-Photon Ionization of Polyatomic Molecules in a Mass Spectrometer

Abstract

A Cluster Expansion Formalism for Direct Calculation of Ionisation Potential and Excitation Energy of Many Electron Systems Using H-F Ground State as Vacuum

Abstract

Nachweis von BrO2 im Belousov-Zhabotinskii-System

Abstract

Monte Carlo Simulation of the Interfaces Liquid-Crystal and Liquid-Rigid Wall

Abstract

Dissection of 13C/12C Isotope Effects on the Cyanoacetylene Partition Function

Abstract

Application of the Model Microfield Method to Stark Profiles of Alkali Metal Resonance Lines

Abstract

Some Properties of a Quartic Potential with a Finite Binding Energy

Abstract

Uranisotopentreiinung mit einem Gegenstromwirbelrohr

Abstract

Ratios of Isotopic Frequencies Using HLFS Method

Abstract

Measurement of Fluorescence Lifetimes of Coumarin Laser Dyes with a Mode-Locked Krypton Ion Laser

Abstract

The Light Guide Effect of Planar Lipid Bilayers and Its Application to Bilayer Spectroscopy

Abstract

Quadrupole Splitting of Vanadium-51 N.M.R. Signals in Nematic Phases

Abstract

Detection of a-Phase Precipitates in Decomposing NiH6 by Bitter Powder Pattern

Abstract

Sachverzeichnis

Autorenverzeichnis

Atomic Hydrogen in the Mineral Brasilianite NaAl₃(PO₄)₂(OH)₄

Microwave Spectra of Dimethylether (CH₃)₂O and (CD₃)₂O in Excited Torsional States

Nachweis von BrO₂ im Belousov-Zhabotinskii-System

Dissection of ¹³C/¹²C Isotope Effects on the Cyanoacetylene Partition Function

Detection of a-Phase Precipitates in Decomposing NiH₆ by Bitter Powder Pattern