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Volume 33 Issue 2

Issue of Zeitschrift für Naturforschung A

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Journal Overview

Open Access June 2, 2014

Quadrupole Splittings of Alkali NMR Signals in Decylammoniumchloride Mesophases

W. Gauß, J. Kronenbitter, 0. Lutz, A. Nolle, G. E. Siegloch

Page range: 105-109

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Abstract

In lyotropic mesophases of decylammoniumchloride the NMR signals of the alkali nuclei 6 Li, 7 Li, 23 Na, 39 K, 85 Rb, 87 Rb and 133 Cs solubilized in these mesophases have been observed. The linewidths of the signals are comparable with the linewidths in aqueous solutions. Apart from 6 Li and 39 K for all other alkali nuclei in the mesophases first-order quadrupole splitted spectra have been observed. For the rubidium isotopes 85 Rb and 87 Rb a ratio of the quadrupole splitting of 2.01 ± 0.05 has been determined. Further the chemical shifts of the solubilized alkali nuclei relative to infinitely diluted aqueous solutions have been measured.

Open Access June 2, 2014

A Test of the Linear Response Theory for Irreversible Processes

0. Seeberg

Page range: 110-120

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Abstract

The temporal development of macroobservables is described within a correlation-functionformalism. The results are exact for a certain class of initial ensembles. The same problem is discussed with the help of the linear-response-formalism. The results agree under certain conditions which should be fulfilled for macroobservables.

Open Access June 2, 2014

Excitation of Low-Frequency Ion Acoustic Perturbations in the Presence of Stationary Lower Hybrid Turbulence

I. Zhelyazkov, S. G. Tagare

Page range: 121-123

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Open Access June 2, 2014

Non-LTE Line Transfer with Diffusion of Excited Atoms II

D. F. Düchs, S. Rehker, J. Oxenius

Page range: 124-129

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Abstract

Non-LTE radiative transfer in a spectral line due to two-level atoms is studied taking the diffusion of excited atoms into account. Numerical results are presented for the case of a stationary, plane parallel plasma of constant total density and temperature without external radiation and without exchange of matter with the surroundings, assuming pure Doppler broadening of the spectral line.

Open Access June 2, 2014

Effect of Polar States on Superexchange Interaction. Application to Some Dimeric Copper (II) Complexes and to CuCl₂ · 2H₂O Linear Chain

G. Amoretti

Page range: 130-140

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Abstract

The effect of polar states on the superexchange interaction between two identical spin 1/2 magnetic ions is examined. The one-body potential contributions to the effective exchange constant J eff are written in terms of the splitting 2Δ 0 between the bonding and antibonding single particle lower-states of the dimeric complex. Moreover, the energies of the basis triplet and singlet states are obtained in an approximated form as functions of Δ 0 and of two-body molecular integrals. The resulting J eff , that is the splitting between the lowest singlet and the triplet, differs from that of the pure Heitler-London treatment owing to the ionic contributions to the singlet wavefunction. The theory is applied to some dimeric copper (II) complexes and to CuCl 2 · 2H 2 O linear chain. It is shown that the polar state corrections are generally small, but that they may become important in the case of copper chlorine, where the various contributions to the Heitler-London exchange constant tend to balance each other to give a very small value. Moreover, antiferromagnetic coupling for CuCl 2 · 2H 2 O is accounted for on the basis of a σ-ground state for the single unit, rather than a π one. The conditions to fit the experimental value of J eff are also discussed.

Open Access June 2, 2014

Redeposition of Sputtered Material in a Glow-Discharge Lamp Measured by Means of an Ion Microprobe Mass Analyser

N. P. Ferreira, P. A. Büger

Page range: 141-144

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Abstract

The redeposition of sputtered material on the target in a Grimm-type glow-discharge lamp was studied by means of an ion microprobe mass analyser (IMMA) using 16 O 2 + ions as bombarding species. The target was an aluminium disc with a cylindrical copper insertion, one mm in diameter. The lamp was operated at currents of 50 mA and 100 mA and a voltage of 1200 V. It is estimated that 17% of the copper atoms sputtered are redeposited and may be resputtered.

Open Access June 2, 2014

The Microwave Spectrum of Oxazole I. The Complete Structure by DRM Microwave Spectroscopy

Anil Kumar, John Sheridan, Otto L. Stiefvater

Page range: 145-152

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Abstract

Double resonance modulation (DRM) microwave spectroscopy has been used to determine the complete substitution structure of oxazole. Isotopic species spectra associated with 13 C, 15 N and 18 O were studied in their natural abundances, while the mono-deuterated species were examined in a mixture of slightly enriched forms. With uncertainties below 0.002 Å and 0.1° for distances and angles, respectively, the structure parameters of oxazole are as follows: 0(1)-C(2) = 1.357 4 Å C(5)0(1)C(2) = 103.9 1 ° C(2)-N(3) = 1.291 5 Å O(1)C(2)N(3) = 114.9 9 ° N(3)-C(4) = 1.395 4 Å C(2)N(3)C(4) = 103.9 2 ° C(4)-C(5) = 1.352 5 Å N(3)C(4)C(5) = 109.0 4 ° C(5)-O(1) = 1.369 6 Å C(4)C(5)0(1) = 1O8.I 4 ° C(2)-H(2) = 1.075 0 Å O(1)C(2)H(2) = 117.0 9 ° C(4)-H(4) = 1.075 1 Å N(3)C(4)H(4) = 121.8 9 ° C(5)-H(5) = 1.073 2 Å O(1)C(5)H(5) = 116.8 6 ° The geometry of oxazole is compared with that of isoxazole and with the structures of the closely related compounds furan and 1,3,4-oxadiazole.

Open Access June 2, 2014

The Microwave Spectrum of Oxazole The DRM-Spectrum of the ¹⁵N-Species in its Natural Abundance

Otto L. Stiefvater

Page range: 153-155

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Abstract

In view of a discrepancy between the rotational constants of the 15 N-species of oxazole reported in an earlier study on a pure 15 N-sample and those found in a recent study on a sample containing the 15 N-species only in its natural abundance, the experimental results of the latter study are reported in detail, and they are compared with predictions based on the results of the earlier work.

Open Access June 2, 2014

Microwave Spectrum of Chloroacetylene in Ground and Excited Vibrational States

Harold Jones, Michio Takami, John Sheridan

Page range: 156-163

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Abstract

The microwave spectrum of chloroacetylene in the ground and excited states has been investigated in the frequency range 15 to 306 GHz. Ground state rotational and nuclear quadrupole coupling constants for twelve isotopic species of chloroacetylene and accurate distortion constants were determined for two of these. The data allowed the r s -structure of chloroacetylene to be reconsidered and the internal consistency of this method of structure determination to be checked. Rotational spectra in five vibrationally excited states, with energy up to 700 cm -1 were observed for four different isotopic species and spectroscopic constants for these states were derived.

Open Access June 2, 2014

Effects of Surfactants and Electrolytes on the Nucleation of Bubbles in Gas-Supersaturated Solutions

Edvard A. Hemmingsen

Page range: 164-171

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Abstract

Various solutions of surfactants and electrolytes were equilibrated with argon at gas pressures up to 202 atm and then decompressed to atmospheric pressure while observed visually or cinemicrographically for occurrence of bubbles. In water, the threshold gas supersaturations for spontaneous nucleation of bubbles at the glass-water interface and in the bulk liquid were 135 atm and 155 atm, respectively. Among the surfactants, only those of molecular weight less than about 330 daltons significantly decreased the cavitation thresholds; those of higher weights had no effect. The electrolytes either had small to moderate or no effect on the threshold, although the dissolved gas concentrations resulting from the solubility changes were greatly decreased. The data indicate that changes in the structure of the solvent water may affect the nucleation process.

Open Access June 2, 2014

Ionization, Excitation and Electron Affinity of Naphthalene, Studied with HAM/3

L. Åsbrink, C. Fridh, E. Lindholm

Page range: 172-180

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Abstract

The electronic structure of naphthalene is calculated using the new semiempirical method HAM/3. The calculated photoelectron spectrum is in reasonable agreement with the measured spectrum. The excitation energies are obtained directly in HAM as the difference of the energies of the unoccupied and the occupied orbitals, and the calculated UV spectrum is in good agreement with experiment. The electron affinities are also obtained directly and are also in agreement with recent measurements. The absorption spectrum of the naphthalene anion is in reasonable agreement with experiment also regarding intensities. All calculations did not require more 76 seconds computer time although no advantage was taken of the symmetry of the molecule.

Open Access June 2, 2014

Voraussage der Temperaturabhängigkeit des Zusatzvolumens einfacher binärer nichtassoziierter Mischungen aus Reinstoffdaten / Predction of the Temperature Depedence of the Excess Volume of Simple Binary Nonassociated Mixtures from Data of the Pure Components

Ernst Liebermann

Page range: 181-184

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Abstract

An equation relating the temperature dependence of the excess volume V E of simple binary liquid nonassociated mixtures to the molar volumes, the isobaric expansivities and the isothermal compressibilities of the pure solvents is proposed. The treatment is based on averaging over the macroscopic properties of the unmixed components on the grounds of classical thermodynamics. Predictions are made without using any empirical parameter.

Open Access June 2, 2014

Induktion smektischer Phasen in binären Mischungen nematischer Flüssigkristalle / Induction of Smectic Phases in Binary Mixtures of Nematic Liquid Crystals

G. Heppke, E.-J. Richter

Page range: 185-189

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Abstract

Binary mixtures of 4-n-alkyl- and 4-w-alkyloxy-4′-cyanobiphenyls with homologous 4,4′-di-n-alkyloxy-azoxybenzenes exhibit the induction of a smectic phase. From some of the phase diagram it can be concluded that the induced smectic phases (ISP) are of the S A type, and this is probably true for all mixtures studied. The thermal stability of the induced smectic phases can not be correlated with the clearing temperatures of the single components, but a dependence on their ability to form smectic phases is very likely. It is postulated that mixtures of terminal polar and terminal non polar nematic liquid crystals are generally able to exhibit the induction of smectic phases.

Open Access June 2, 2014

Enthalpien von Kupfer- und Silberchalkogeniden / Enthalpies of Copper and Silver Chalcogenides

Roger Blachnik, Paul-G. Gunia

Page range: 190-196

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Abstract

The enthalpy contents of Cu 2 Se, Cu 2 Te, Ag 2 Se and Ag 2 Te at temperatures between 350 K to 50 K above the melting points were measured in an isoperibolic drop-calorimeter. Thermodynamic data of the compounds were derived from these measurements. An analysis of the data leads to the conclusion that a high degree of order is retained in the melts of these compounds, and that the bond character of these melts is partially ionic. An unusual decrease of C p with increasing temperature immidiately after the transition temperatures could be confirmed.

Open Access June 2, 2014

Investigation of Collision Induced Transitions in the Microwave Range: Ethylene Oxide and Carbonylsulfide

H. Dreizler, W. Schrepp

Page range: 197-203

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Abstract

Collisional energy transfer between rotational levels of ethylene oxide C 2 H 4 O, its deuterated species C 2 D 4 O and carbonyl sulfide OCS, has been investigated by means of microwave-microwave four-level double resonance. The results are in agreement with collisional selection rules which can be predicted in the weak collision limit. Collisionally induced transitions up to ΔJ = 4 have been detected for C 2 D 4 O.

Open Access June 2, 2014

Rotation-Torsion-Vibration Interaction in Acetyl Cyanide: Normal and ¹⁵N Isotopic Species

G. K. Pandey, H. Dreizler

Page range: 204-213

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Abstract

The rotation - torsion - vibration interaction in the normal and 15 N isotopic species of Acetyl Cyanide is studied in the rotational spectrum of ground, first excited state of methyl torsion and first excited state of CCN in plane bending vibration. With respect to a previous -work [1] a more detailed check of a model with five degrees of freedom, comprising three for the overall rotation and two for the two lowest vibrations was possible. Potential parameters were fitted simultaneously to the splittings of the rotational transitions in the ground, excited torsional and excited vibrational states for the normal and 15 N isotopic species of the molecule. The coefficients V 3 and V 6 of the Fourier expansion of the hindering potential for the torsion and two interaction constants V 3c ′ and F 3c ″ for the torsion and in plane CCN bending vibration were determined, apart from the harmonic force constant k 2q for the vibration, which is obtained from the measured infrared data of the normal species. Using these results, the (E-A) splittings of the rotational transitions could be nicely reproduced but not the absolute frequencies of the rotational transitions.

Open Access June 2, 2014

Electronic Properties of Möbius Systems

Ivan Gutman

Page range: 214-216

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Abstract

The main π-electron properties (energy level distribution, total electron energy, charge distribution) of Möbius systems are analysed. A number of results, known previously for Hückel systems is generalized and/or modified for Möbius systems. The main conclusions of the work are summarized in Rules 1-7.

Open Access June 2, 2014

¹H Spin-Gitter-Relaxationszeitmessungen an Alkoholen / ¹H Spin-Lattice Relaxationtime Measurements on Alcohols

H. Sterk, H. Kopp

Page range: 217-221

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Abstract

1 H spin-lattice relaxationtimes T 1 have been measured on alcohols, ethers, acetylacetone and cyclohexandione-1,3, solved in CCl 4 and pure. The relaxationtime T 1 increases characteristically with decreasing chain length, molecular size and viscosity, as well as with the distance from the OH-group and CCl 4 dilution. Segmental motions and the breaking of hydrogen bondings are determined as the reason of this behaviour. Deuteron substitution and T 1 measurements at different temperatures show that the dipol-dipol interaction is the predominant mechanism of relaxation.

Open Access June 2, 2014

The Molecular Geometry of Trichloromethyl Sulphonyl Chloride as Studied by Electron Diffraction. Estimation of the Barrier to Internal Rotation

Jon Brunvoll, István Hargittai, Ragnhild Seip

Page range: 222-224

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Abstract

The molecular geometry of trichloromethyl sulphonyl chloride has been determined by electron diffraction. The sulphur bond configuration [r g (S=0) 1.421±0.003 Å, r g (S-Cl) 2.021 ±0.005 Å, r g (S-C) 1.87±0.03 Å, ∠O=S-C 108.3±0.7°, ∠C-S-Cl97.9±0.8°, ∠O=S=O 121.5±0.9° and ∠O=S-Cl 109.2±0.6°] is consistent with the characteristic structural variations observed in the sulphone series. The barrier to internal rotation around the S-C bond was estimated to be between 3.5 and 6 kcal mol -1 by means of various procedures and assumptions.

Open Access June 2, 2014

Viscosity of a Polar Gas of Symmetric Top Molecules in Perpendicular Electric and Magnetic Fields

W. E. Köhler

Page range: 225-227

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Abstract

A kinetic theory treatment of the influence of perpendicular magnetic and electric fields on the viscosity is given for a polar gas of symmetric top molecules. Expressions for the 9 independent viscosity coefficients are derived. In particular, the electric field influence on the transverse viscomagnetic pressure difference is studied.

Open Access June 2, 2014

Zur Messung von negativen Soret-Koeffizienten / Soret Coefficients of Negative Sign

H. Korsching

Page range: 228-228

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Abstract

A cell with a small lateral dimension of 0.7 mm is constructed in order to avoid the possibility of disturbing convection. The temperature gradient can be set up downwards or upwards. A positive sign results for KCl in water but LiJ has a negative Soret coefficient, which is measured up to a molality of four at 25 °C.

Open Access June 2, 2014

ESR of Cr³⁺ in Aluminium Chloride Hexahydrate

V. K. Jain, Putcha Venkateswarlu

Page range: 229-230

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Abstract

The angular dependence of the ESR spectrum of Cr 3+ ions in AlCl 3 · 6H 2 O has been studied. In addition to the allowed fine structure lines some weak low field lines, identified as fine forbidden transitions, have been observed.

Open Access June 2, 2014

Do Free Carriers Influence Polariton Scattering Intensities in GaAs?

R. Claus

Page range: 231-231

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Abstract

An influence of free carriers in GaAs on polariton scattering intensities is shown to take place due to two mechanismus: a) The altered LO-phonon frequency changes the electrooptic coefficient and b) the macroscopic electric field becomes changed. Both quantities influence the scattering intensities.

Open Access June 2, 2014

Intramolecular Rotation in Some Trihalogenated Esters at Microwave Frequencies

H. D. Purohit, A. D. Vyas, H. C. Lunker

Page range: 232-234

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Abstract

The permittivity and dielectric loss of methyl, ethyl and n-propyl trichloroacetate in decalin solution have been measured at four microwave frequencies viz., 30.20, 24.50, 18.26 and 9.83 GHz and also at 1 MHz and optical frequency at 35 °C. The permittivity and dielectric loss at different frequencies have been plotted against concentration (wt. fraction). The slopes of these straight lines have been used for complex plane plots (a″ vs a′). The dispersion curves which could not be resolved in benzene could be resolved in decalin due to the increase in viscosity of the solvent. Data have been analysed in terms of two relaxation processes i.e., overall rotation and group rotation.

Open Access June 2, 2014

Ferromagnetism in Some Semi-Conducting Heavy Rare-Earth Molybdates

H. B. Lai, R. N. Pandey

Page range: 235-237

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Abstract

Measurements of the magnetic susceptibility of powdered samples of Dy 2 (MoO 4 ) 3 , H O2 (Mo O4 ) 3 and Er 2 (MoO 4 ) 3 in the temperature range 300 to 920 K are reported. The Curie Weiss Law is obeyed and yields the magneton numbers 10.72, 10.68 and 9.68 for the Dy 3+ , Ho 3+ and Er 3+ ions, respectively, the theoretical values being 10.63, 10.60 and 9.60. The results are analysed in terms of molecular field theory and it is predicted that Dy 2 (MoO 4 ) 3 , Ho 2 (MoO 4 ) 3 and Er 2 (MoO 4 ) 3 become ferromagnetic below 12, 17 and 5 K, respectively.

Open Access June 2, 2014

Multiple Fluorescence of 7-Hydroxylepidone

Otto S. Wolfbeis, E. Lippert

Page range: 238-239

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Abstract

The fluorescence spectra of the title compound have been measured in ethanol and in aqueous solutions of different pH. In ethanol the neutral molecule's fluorescence (at 360 nm) is observed, whereas in aqueous solutions emission occurs from the anion (at 428 nm) and from a "tautomeric" species (at 460 nm), but not from the neutral molecule. An aqueous solution at pH 3, which contains about 30% of ethanol gives a broad fluorescence band ranging from the near uv to the orange region of the spectrum. Contrarily, 7-methoxylepidone has no fluorescence maximum in the visible part of the spectrum.

Open Access June 2, 2014

On the Thermal Behaviour of Some Alkali Branched Alkanoates. Note I

P. Ferloni, M. Sanesi, P. L. Tonelli, P. Franzosini

Page range: 240-242

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Abstract

Lithium, sodium and potassium isobutyrates, isovalerates and isocaproates were submitted to a differential scanning calorimetric investigation in the temperature range between 320 K and the isotropic melt region. The collected phase transition temperatures and heat effects are compared to those of the corresponding linear isomers. In particular the occurrence of mesomorphic liquids and the width of their existence fields is discussed.

Open Access June 2, 2014

Molecular Complexes of Macrocyclic Polyethers with Fluoranil

Y. Jayathirtha, V. Krishnan

Page range: 243-244

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Abstract

Fluoranil forms weak 1:1 molecular complexes with both benzene substituted and nonbenzenoid macrocyclic ethers. 19 FMR shifts have been used for the evaluation of association constants. The infrared and 1 HMR data of the complexes reveal relative orientations of the molecules in the complexes.

Open Access June 2, 2014

Elektronenkorrelationseffekte in der Elektronendichteverteilung von Stickstoff und Acetylen / Effects of Electron Correlation in the Electron Density Distribution of Nitrogen and Acetylene

Hans-Lothar Hase, Karl-Wilhelm Schulte, Armin Schweig

Page range: 245-246

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Abstract

It is shown by AHF-CI calculations that the changes in the electron distribution in bonding and lone pair regions of nitrogen and acetylene due to electron correlation can be neglected when calculating electron difference densities of these molecules. The changes brought about by electron correlation are such that the electron density in interatomic regions is reduced and in atomic (core) regions increased. These results might meet general interest in the area of electron difference density determinations.

Open Access June 2, 2014

Photoelectron Spectroscopy of Heterocycles. Polypyridines

I. Novak, L. Klasinc

Page range: 247-248

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Abstract

The photoelectron (PE) spectra of 2,2′-bipyridine 1, 2,2′:6′,2″-terpyridine 2, and 2,2′,2″,2‴-tetrapyridine 3 have been measured using He I radiation. For 1-3 standard SCF LCAO MO calculations wer also performed. Comparison of PE spectra and these calculations allowed the assignment of π-ionizations and indirectly also the nitrogen lone pair ionizations in 1-3. Factors influencing the conformations of 1-3 in the gas phase are also mentioned.

Open Access June 2, 2014

Ab-initio Crystal Orbital Study of Hydrogen Fluoride Chain. Basis Set Dependence / The Influence of Various Basis Sets in Ab-initio Crystal Orbital Studies is Reported for Hydrogen Fluoride Chain

M. Kertesz, J. Koller, A. Ažman

Page range: 249-250

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Open Access June 2, 2014

Determination of Ionic Mobilities of Uranium in n-Propanol and n-Butanol at 25 °C

G. Marx, H. Nitsche

Page range: 251-252

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Abstract

In the system UO 2 (NO 3 ) 2 · 6H 2O /n-Propanol the limiting ionic conductance of (1/2UO 2 2+ ) was found to be 12.31 cm 2 Ω -1 mol -1 at 25 °C, its association constant being 3.6 · 10 9 l 2 mol -2 . The corresponding values in the system UO 2 (NO 3 ) 2 · 2H 2 O/n-Butanol are: λ°=23.57 cm 2 Ω -1 mol -1 and K A = 1.5 · 10 11 l 2 mol -2 .

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.

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Atomic, Molecular & Optical Physics
Chemical Physics
Dynamical Systems & Nonlinear Phenomena
Fundamental Concepts of Physical Sciences
Gravitation & Cosmology
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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 2

Issue of Zeitschrift für Naturforschung A

Quadrupole Splittings of Alkali NMR Signals in Decylammoniumchloride Mesophases

Abstract

A Test of the Linear Response Theory for Irreversible Processes

Abstract

Excitation of Low-Frequency Ion Acoustic Perturbations in the Presence of Stationary Lower Hybrid Turbulence

Non-LTE Line Transfer with Diffusion of Excited Atoms II

Abstract

Effect of Polar States on Superexchange Interaction. Application to Some Dimeric Copper (II) Complexes and to CuCl2 · 2H2O Linear Chain

Abstract

Redeposition of Sputtered Material in a Glow-Discharge Lamp Measured by Means of an Ion Microprobe Mass Analyser

Abstract

The Microwave Spectrum of Oxazole I. The Complete Structure by DRM Microwave Spectroscopy

Abstract

The Microwave Spectrum of Oxazole The DRM-Spectrum of the 15N-Species in its Natural Abundance

Abstract

Microwave Spectrum of Chloroacetylene in Ground and Excited Vibrational States

Abstract

Effects of Surfactants and Electrolytes on the Nucleation of Bubbles in Gas-Supersaturated Solutions

Abstract

Ionization, Excitation and Electron Affinity of Naphthalene, Studied with HAM/3

Abstract

Voraussage der Temperaturabhängigkeit des Zusatzvolumens einfacher binärer nichtassoziierter Mischungen aus Reinstoffdaten / Predction of the Temperature Depedence of the Excess Volume of Simple Binary Nonassociated Mixtures from Data of the Pure Components

Abstract

Induktion smektischer Phasen in binären Mischungen nematischer Flüssigkristalle / Induction of Smectic Phases in Binary Mixtures of Nematic Liquid Crystals

Abstract

Enthalpien von Kupfer- und Silberchalkogeniden / Enthalpies of Copper and Silver Chalcogenides

Abstract

Investigation of Collision Induced Transitions in the Microwave Range: Ethylene Oxide and Carbonylsulfide

Abstract

Rotation-Torsion-Vibration Interaction in Acetyl Cyanide: Normal and 15N Isotopic Species

Abstract

Electronic Properties of Möbius Systems

Abstract

1H Spin-Gitter-Relaxationszeitmessungen an Alkoholen / 1H Spin-Lattice Relaxationtime Measurements on Alcohols

Abstract

The Molecular Geometry of Trichloromethyl Sulphonyl Chloride as Studied by Electron Diffraction. Estimation of the Barrier to Internal Rotation

Abstract

Viscosity of a Polar Gas of Symmetric Top Molecules in Perpendicular Electric and Magnetic Fields

Abstract

Zur Messung von negativen Soret-Koeffizienten / Soret Coefficients of Negative Sign

Abstract

ESR of Cr3+ in Aluminium Chloride Hexahydrate

Abstract

Do Free Carriers Influence Polariton Scattering Intensities in GaAs?

Abstract

Intramolecular Rotation in Some Trihalogenated Esters at Microwave Frequencies

Abstract

Ferromagnetism in Some Semi-Conducting Heavy Rare-Earth Molybdates

Abstract

Multiple Fluorescence of 7-Hydroxylepidone

Abstract

On the Thermal Behaviour of Some Alkali Branched Alkanoates. Note I

Abstract

Molecular Complexes of Macrocyclic Polyethers with Fluoranil

Abstract

Elektronenkorrelationseffekte in der Elektronendichteverteilung von Stickstoff und Acetylen / Effects of Electron Correlation in the Electron Density Distribution of Nitrogen and Acetylene

Abstract

Photoelectron Spectroscopy of Heterocycles. Polypyridines

Abstract

Ab-initio Crystal Orbital Study of Hydrogen Fluoride Chain. Basis Set Dependence / The Influence of Various Basis Sets in Ab-initio Crystal Orbital Studies is Reported for Hydrogen Fluoride Chain

Determination of Ionic Mobilities of Uranium in n-Propanol and n-Butanol at 25 °C

Abstract

Effect of Polar States on Superexchange Interaction. Application to Some Dimeric Copper (II) Complexes and to CuCl₂ · 2H₂O Linear Chain

The Microwave Spectrum of Oxazole The DRM-Spectrum of the ¹⁵N-Species in its Natural Abundance

Rotation-Torsion-Vibration Interaction in Acetyl Cyanide: Normal and ¹⁵N Isotopic Species

¹H Spin-Gitter-Relaxationszeitmessungen an Alkoholen / ¹H Spin-Lattice Relaxationtime Measurements on Alcohols

ESR of Cr³⁺ in Aluminium Chloride Hexahydrate