Published by De Gruyter

Volume 27 Issue 4

Issue of Zeitschrift für Naturforschung A

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Open Access June 2, 2014

Eine Approximation der Löwdinschen natürlichen Orbitale für Moleküle mit einer Green-Funktion-Methode

R. Albat

Page range: 545-552

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Abstract

An Approximation of Löwdin's Natural Orbitals for Molecules with a Green's Function Method The many-body-pertubation theorie of the single-particle Green's function is used to get an approximate first-order density matrix. Slightly modified SCF-orbitals form the basis for the expansion. The mass-operator in Dyson's equation is considered up to second order in the Perturbation. In the present form the method is only applicable to ground states with closed shells. The ground states of the molecules LiH and NH3 serve as examples to demonstrate the usefulness of the directly calculated natural orbitals for application in the C I-method. The natural orbitals give a much better convergence of the C I-expansion than the SCF-orbitals do.

Open Access June 2, 2014

Quasi-Equilibrium Theory of Ionic Fragmentation: Further Considerations

Cornelius E. Klots

Page range: 553-561

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Abstract

A recent reformulation of quasi-equilibrium theory is extended to several additional classes of ionic decompositions. Formulae for calculating average translational and rotational energies of the fragments are presented, and kinematic corrections to the formulas are introduced. Illustrative calculations are compared with experiment, and the interesting possibility of maxima in rate constants is noted.

Open Access June 2, 2014

Determination of a Static Hyperfine Interaction Following Recoil into Vacuum

Y. Dar, P. Engelstein, J. Gerber, R. Levy, J.P. Vivien

Page range: 562-565

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Abstract

By means of using a plunger time-differential technique, spin precessions from a static free hyperfine interaction have been observed for low-energy 152 Sm nuclei recoiling into vacuum.

Open Access June 2, 2014

Mössbauer-Effekt am Fe⁵⁷ in Additions-und Substitutionsverbindungen des Natrium-Nitrosylprussiates / Mössbauer-Effect in Fe⁵⁷ of Addition and Substitution Compounds of Sodium Nitroprusside

Ulrich Weihofen

Page range: 565-571

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Abstract

Investigating 21 iron complex compounds of the type [Fe(CN) 5 NOL] n- or [Fe(CN) 5 L] 3- it was found that isomeric shift, quadrupol splitting, and Goldanskii effect depend on the purity of the compound. Varying the amount of impurity discrepancies between formerly published data could be explained. The Mössbauer spectra of three compounds showed line widths differing from the theoretical value only by a few per cent. This indicated that a very high purity had been achieved. In all cases information about the molecular structure and the bond strength between the central Fe-atom and its ligands was obtained.

Open Access June 2, 2014

Level-Crossing-Experimente an einigen Heliumzuständen bei Ionenstoßanregung / Level-Crossing-Experiments on some He States excited by Ion Impact

Klaus Buchhaupt

Page range: 572-579

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Abstract

An den Heliumzuständen 3 3 P, 4 3 P, 5 3 P, 3 3 D, 4 3 D, 3 1 D , 4 1 D und 5 1 D wurden Hanle-Effekt-Experimente bei Ionenstoßanregung mit Wasserstoff- bzw. Helium-Ionen durchgeführt. Die Breiten der Hanle-Effekt-Signale der Ausrichtung wurden in Abhängigkeit vom Heliumdruck in der Stoßkammer gemessen. Aus der Druckabhängigkeit der Signalbreiten konnten die natürlichen Lebensdauern τ 0 und die Wirkungsquerschnitte σ (2) für die Zerstörung der Ausrichtung bestimmt werden. Bei Anregung durch Helium-Ionenstoß ergaben sich die Werte 3 3 P: τ 0 = 98 ± 4,3 ns, σ (2) = (2,0 ± 0,5) · 10 -14 cm 2 , 4 3 P: τ 0 = 137 ± 9,4 ns, 5 3 P: τ 0 = 196 ± 56 ns, σ (2) = (5,3 ± 1,1) · 10 -14 cm 2 , 3 3 D: τ 0 = 39,0 ± 1,4 ns, σ (2) = (4,6 ± 0,5) · 10 -14 cm 2 , 4 3 D: τ 0 = 35,5 ± 1,2 ns, σ (2) = (2,9 ± 0,2) · 10 -14 cm 2 , 3 1 D: τ 0 = 15,8 ± 0,1 ns, σ (2) = (2,4 ± 0,3) · 10 -14 cm 2 , 4 1 D: τ 0 = 39,2 ± 0,8 ns, σ (2) = (4,8 ± 0,5) · 10 -14 cm 2 , 5 1 D: τ 0 = 71,9 ± 1,8 ns, σ (2) = (9,6 ± 1,0) · 10 -14 cm 2 . Aus der Abhängigkeit der Produkte ν für die Zustände 4 1 D und 5 1 D von der kinetischen Energie der anregenden Ionen wurde auf eine Impulsübertragung bei der Ionenstoßanregung geschlossen.

Open Access June 2, 2014

Level-Crossing-Experimente am bewegten Leuchten / Level-Crossing Experiments on High Velocity Atoms

W. Bachmann, W. Janke

Page range: 579-582

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Abstract

Durch Stoßwechselwirkung zwischen einem Helium-Ion und einem Neon-Atom findet unter ande-rem ein Elektroneneinfang in einen angeregten, teilweise ausgerichteten Heliumzustand statt. Es wurde die Breite des durch Elektroneneinfang angeregten 4 1 D-Heliumzustands in Abhängigkeit vom Fremdgasdruck des Neon und in Abhängigkeit von der Geschwindigkeit der Heliumatome mit Hilfe des Hanle-Effekts gemessen. Daraus wurde die Geschwindigkeitsabhängigkeit der Wirkungs-querschnitte σ D (2) (ν) zur Zerstörung der Ausrichtung der angeregten Heliumatome infolge von Stößen mit Neonatomen bestimmt. Im Energiebereich von 5 keV bis 30 keV war das Produkt ν · σ D (2) (ν) konstant, d.h. ν · σ D (2) (ν) proportional ν -1 . Als zusätzliches Ergebnis erhielten wir die natürliche Lebensdauer des 4 1 D-Zustandes zu (38,4 ± 2,1) nsec.

Open Access June 2, 2014

Sound Propagation in Dilute Polyatomic Gases

H. Moraal, F. Mccourt

Page range: 583-592

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Abstract

Sound propagation in dilute pure gases, both monatomic and polyatomic, has been considered from the point of view of the Waldmann-Snider equation. It is shown that the commonly employed assumption that sound propagation in gases is equivalent to the propagation of plane waves is valid only in the region where collisions restore equilibrium faster than it is perturbed by the sound waves. A systematic truncation procedure for an expansion of the perturbation function in irreducible Cartesian tensors is introduced and then illustrated in solutions for three specific kinds of molecules, helium, nitrogen and rough spheres. The agreement between theory and experiment is rather good for sound absorption in the region where the ratio of the collision and sound frequencies is greater than 1.5. The agreement in the case of dispersion is good over the whole measured pressure range. One useful result obtained is to show the polyatomic gas calculations in second approximation have as good agreement with experiment as the calculations for noble gases in third approximation. This can be related to the possession by the polyatomic gas of a bulk viscosity which dominates in sound propagation.

Open Access June 2, 2014

Parametric Study of Functions of Molecular Vibrations

IV. Coriolis Coupling Constants for the Molecules XY² and X³ (Symmetry C_2V)

A. Alix, L. Bernard

Page range: 593-596

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Abstract

In this work, the authors give the parametric form of the Zeta constants for the case of the molecules XY 2 and X 3 (symmetric species C 2v ), as a function of the mathematical parameter a which generates all the solutions, and of the molecular coupling coefficient Ψ 12 between two symmetry coordinates S 1 (A 1 ) and S 2 (A 1 ).

Open Access June 2, 2014

Zum Rotations-Zeeman-Effekt in Dimethylketen / Molecular Zeeman Effect and the Determination of the Molecular g Values, Paramagnetic Susceptibilities, and Molecular Quadrupole Moments in Dimethylketene

D. Sutter, L. Charpentier, H. Dreizler

Page range: 597-600

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Abstract

The rotational Zeeman-Effect in the microwave spectrum of dimethylketene was investigated at fieldstrengths close to 22 kG. Only ΔJ= 1 rotational transitions with ΔM = ± 1 selection rules did show appreciable splittings due to the magnetic field. From the splittings the diagonal elements of the molecular gr-tensor were determined to be: g aa = ∓ 0.020(3) ; g bb = ∓ 0.0165(8) ; g cc = + 0.0126(5). (Only the relative signs of the g-values are obtained from the experiment). The susceptibility anisotropics were found to be close to zero.

Open Access June 2, 2014

A Simple and Reliable Dye Laser System for Spectroscopic Investigations

J. Kühl, G. Marowksy, P. Kunstmann, W. Schmidt

Page range: 601-604b

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Abstract

Efficient spectral narrowing and accurately reproducible tuning of a dye laser has been achieved by the combination of a low-loss narrow-band interference filter and a solid-quartz-plate-Fabry-Perot-etalon. Bandwidths as small as 5-10 -3 Å were obtained by this simple system increasing the spectral density by a factor of at least 2 · 10 3 .

Open Access June 2, 2014

Thermal Properties of Alcaline-Earth-Oxides / III. Analysis of Anharmonic Effects

E. Gmelin, S. Vieira

Page range: 605-612

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Abstract

Experimental heat capacity data for the alcaline-earth-oxides have been used to analyse by a new method the high temperature thermodynamic properties of these crystals in terms of quasi-harmonic and explicit anharmonic contributions. The explicit anharmonic contribution ΔC is consistent with theoretical predictions; ΔC is proportional to T in a first order approximation. The factor of anharmonicity A is negative for MgO, A = (-0.4 + 0.4) · 10 -5 K -1 , for SrO A= (-2.8±1) · 10 -5 K -1 and for BaO A=(-3.9±1) ·10 -5 K -1 , but positive for CaO A = (2.3 ± 1.2) · 10 -5 K -1 . Comparison with the results of analysis of the anharmonic effects in the alcaline-halides shows that the alcaline-earth-oxides may be treated by the same models valuable for the alcaline-halides. The results suggest that the type of anharmonic forces is determined in the alcaline-halides as well as in the alcaline-earth-oxides primarily by the cation of the salt.

Open Access June 2, 2014

Diffusion von Antimon in Gold

Chr. Herzig, Th. Heumann

Page range: 613-617

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Abstract

Die Diffusion von Antimon in Gold wurde in grobkristallinen Proben bei sehr geringer Fremdatomkonzentration mit der Elektronenstrahlmikrosonde im Temperaturbereich von etwa 620 °C bis 1000 °C gemessen. Für Temperaturen über 730 °C lassen sich die Diffusionskoeffizienten darstellen durch die Arrhenius-Beziehung: D = (1,14 ± 0,19) · 10 -2 exp {-(30,90 ± 0,38 kcal/RT) } [cm 2 /sec] . Die Ergebnisse werden diskutiert bezüglich des Modells von LeClaire über die Fremddiffusion in Metallen.

Open Access June 2, 2014

Diffusion of He, Ne, and Ar in Vitreous and Partially Devitrified Germani um Dioxide

W.W. Brandt, B. Rauch, J. Wagner

Page range: 617-623

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Abstract

The diffusion coefficients of He, Ne, and Ar in various samples of GeO 2 and approximate values for the corresponding solubility coefficients were obtained from nonisothermal and isothermal desorption experiments. The data show trends similar to those obtained on fused SiO 2 , and are interpreted by assuming that the glasses contain many interstices of different critical dimensions and a variety of diffusion paths corresponding to a range of activation energies. Some annealed and partially devitrified samples were studied and the activation energies of diffusion were found to be relatively high. In a few cases, the measurements were extended into and above the glass transition range (∼570°) ; the resulting activation energy and the preexponential factor of the Arrhenius equation for the diffusion coefficient were markedly increased, indicating that the diffusion mechanism is probably drastically changed.

Open Access June 2, 2014

Die Molekülstruktur des 3.3.6.6-Tetramethyl-1-thiacycloheptins (C₁₀H₁₆S) / The Molecular Structure of 3.3.6.6-Tetramethyl-1-Thiacycloheptine

Joachim Haase, Adolf Krebs

Page range: 624-627

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Abstract

Die Molekülstruktur des 3.3.6.6-Tetramethyl-thiacycloheptins wurde mit Hilfe der Methode der Elektronenbeugung an Gasen bestimmt. Die Ergebnisse dieser Untersuchung, die in Tab. 1 zusammengestellt sind, werden im Zusammenhang mit den Ergebnissen der Strukturbestimmung des Cyclooctins diskutiert.

Open Access June 2, 2014

Photolyse des Äthylens im Bereich 147 — 193 nm / Ethylene Photolysis At 147 — 193

P. Potzinger, L. Glasgow, G. Bünau

Page range: 628-638

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Abstract

Ethylene photolysis was investigated at 147, 163, 185 and 193 nm. The following three primary processes were observed at all wavelengths C 2 H 4 + hν → C 2 H 2 + H 2 , (1) C 2 H 4 + hν → C 2 H 2 + 2H, (2) C 2 H 4 + hν → C 2 H 3 + H. (3) (1) was independent of all experimental parameters tested: temperature, pressure, wavelength, scavenger, and light intensity. (2) decreases with increasing pressure and increases with increasing photon energy. (3) shows almost no pressure dependence at 185 nm and decreases in importance with increasing photon energy. A kinetic analysis shows that participation of at least three different states of ethylene must be invoked to explain the results. A tentative correlation of these states with the spectroscopic states of ethylene is given.

Open Access June 2, 2014

Quantenchemische und spektroskopische Untersuchungen an Porphyrinen. III. Die Chlorine / Quantum Chemical and Spectroscopical Studies on Porphyrins. III. The Chlorins

J.V. Knop, H. Stichtenoth

Page range: 639-644

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Abstract

Zur Deutung der Elektronenanregungsspektren von Chlorin, Ni-Chlorin e 6 , des Chlorin-Dianions und Chlorin-Dikations wurden Pariser-Parr-Pople-Berechnungen mit Berücksichtigung von 90 ein-fach angeregten Konfigurationen durchgeführt. Neben neuen Gesichtspunkten zur Zuordnung der Elektronenübergänge im Absorptionsspektrum konnten auch experimentelle Voraussagen hinsichtlich der Ladungsverteilung im Molekülgerüst bestätigt werden.

Open Access June 2, 2014

Bewegungen der CH₃ -Gruppen in Methyl-Naphthalin-Kristallen

II. Quantitative Diskussion der Protonenspin-Relaxation / Rotation of Ch₃ Groups in Methyl Naphthalene Crystals

J.U. Schütz, F. Noack

Page range: 645-651

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Abstract

The temperature and frequency dependencies of the proton spin relaxation in methyl naph-thalenes discussed in a preceding paper can be described quantitatively by assuming a rotatory jump model of the methyl groups in connection with a Cole-Davidson distribution of jumping times. The observed activation barriers are derived in good approximation from a Buckingham potential.

Open Access June 2, 2014

Zur Begrenzung der radial en Ausdehnung des Li chtbogenstromes durch ein axiales Magnetfeld. II. Skalengesetze und Vergleich mit Experimenten / On Limitation of the Radial Extent of the Arc Current by Means of an Axial Magnetic Field. II. Scaling Laws and Comparison with Experimental Results

O. Klüber

Page range: 652-670

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Abstract

In an arc with superimposed axial magnetic field, radial current components cause a rotational motion of the plasma column and produce azimuthal Hall currents and hence electromotive forces such that the arc current is guided by the magnetic field lines. In the first part of this paper the steady-state plasma equations have been solved for a homogeneous plasma in simple geometry, allowance being made for finite viscosity. Here, scaling laws giving the radial extent of the arc current are obtained. In addition, electrodes with finite cross sections are treated. The results of model calculations agree well with experimental data. Generally, the model is applicable, if the angular frequency of the plasma is small compared with the ion gyration frequency.

Open Access June 2, 2014

ortho-Effects in Mass Spectra. Alteration of the Molecular-Ion Energy Distribution in Disubstituted Acetanilides

Steven Benezra, Maurice Bursey

Page range: 670-677

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Abstract

Simplified quasi-equilibrium calculations performed on the mass spectra of dihalosubstituted phenyl acetates and acetanilides again uncover the same substituent effects on the rise of K with E for the loss of ketene from phenyl acetates as was determined for the monosubstituted phenyl acetates. However, a new effect is found for the disubstituted acetanilides, removal of excitation probability for low-lying energy states of the molecular ion. This effect parallels the removal of transition probability for the lowest excited state of the neutral molecule.

Open Access June 2, 2014

Massenspektrometrie am negativen Glimmlicht einer zylindrischen Hohlkathode / Mass Spectrometric Studies of the Negative Glow of a Cylindrical Hollow Cathode Discharge

M. Pähl, W. Lindinger, F. Howorka

Page range: 678-692

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Abstract

Positive ions were extracted from the negative glow (NG) of a cylindrical hollow cathode discharge (h.c.d.) through a plane sampling probe (diameter 1 mm, orifice dia. 50 [xm, Molyb-denum) and analyzed in a 60° mass spectrometer. The discharge was operated in pure Argon with an admixture of about 0.1% of H20. The principal ions were Ar + , Ar ++ ,r 2 + , ArH + , H 2 0 + and H 3 O + . The individual ion currents were measured as functions of the probe potential U\>, at dif-ferent discharge currents (2 - 7 mA) and of the gas pressure (0,05 - 0,5 torr). The reaction scheme for the production and conversion of these ions in the NG could be established. In general, the ions were extracted from the axis of the h.c.d. When the sampling probe was mounted excentrically (3 mm out of the axis), the ratio of secondary to primary ions was higher in the axis. At probe potentials above +15 v referred to anode no ions from the NG reached the probe, but electrons were accelerated so that ionization of the neutral gas could arise in and behind the orifice. The Ar ++ current as a function of U b together with other results suggested the presence of very fast electrons (energy > 100 v) in the sampling orifice. They could be identified as electrons from the cathode fall region which were scattered into the orifice. Studies of the ion currents from Ar-H 2 mixture proved the sampling probe suitable as an electron impact ion source.

Open Access June 2, 2014

Untersuchungen an stromstarken Kapillarentladungen. Teil III: Spektroskopische Messungen / Investigations on High Current Capillary-Discharges. Part 111: Spectroscopic Measurements

Horst Ehrich, Hans Jürgen Kusch

Page range: 693-699

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Abstract

The spectra of the capillary discharges described in Part I and II were investigated. A survey of the spectral emission was obtained by photographic spectroscopy while high-accuracy measurements of the intensity distribution in the wavelength region of 2100 - 6000 Å were performed using photoelectric techniques. Special care was taken for the current vs. intensity-curve of the photo-multiplier and the transparency of the filters used. According to the high reproducibility of the end-on emission of capillary discharges light sources of this type are very suitable for intensity calibration in the field of μsec-spectroscopy.

Open Access June 2, 2014

Molecular Force Fields of Tungsten and Uranium Hexachlorides

M.N. Avasthi, M.L. Mehta

Page range: 700-701

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Abstract

Molecular force field studies of tungsten and uranium hexa-chloride have been carried out using the Urey-Bradley force field (UBFF) and the orbital valence force field (OVFF). Weighted least square adjustment has been used to fit the observed frequencies. Comments are also made on the suit-ability of the force fields used. The trends in stretching force constants have been discussed.

Open Access June 2, 2014

Hyperfeinstruktur Des Csbr

J. Hoeft, E. Tiemann, T. Törring

Page range: 702-703

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Abstract

The quadrupole hyperfine structure of 133 Cs 79 Br was measured on the rotational transition l=1 → 2 at 4.3 GHz. The obtained quadrupole coupling constants of 79 Br in various vibrational states are reported.

Open Access June 2, 2014

Rotationsspektrum des PN

J. Hoeft, E. Tiemann, T. Törring

Page range: 703-704

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Open Access June 2, 2014

Rotational Zeeman-Effect of [2,5-D₂]-Furan

B. Bak, D.H. Sutter, H. Dreizler

Page range: 705-707

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Open Access June 2, 2014

Über Ein Neues Radiofrequenz-Mikrowellen- Doppelresonanzexperiment

R. Schwarz, H. Dreizler

Page range: 708-709

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Open Access June 2, 2014

ESR, Dielectric and Optical Absorption of Manganese (II) Chloro Complexes in DMF and DMA Solution

H Pirot, M. Stockhausen

Page range: 709-711

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Open Access June 2, 2014

Characteristics of a Tunable Travelling Wave Dye Ring Laser

G. Marowsky, L. Ringwelski, F.P. Schäfer

Page range: 711-713

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Abstract

A flashlamp pumped dye ring laser using 4 Abbé prisms of constant 90 degree deviation has been built. Travelling wave operation is obtained when the counterclockwise wave is fed back by a beam-splitting output prism. The laser emission offers remarkable frequency stability when narrowed down to a linewidth of 7 pm by the use of an intracavity solid Fabry-Perot etalon.

Open Access June 2, 2014

Abklingzeiten und Radiolumineszenzausbeuten von Styrenlösungen PPO im Polymerisations- prozeß

M. Grodel, Z. Polacki

Page range: 713-715

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Open Access June 2, 2014

¹³C-NMR Chemical Shift Anisotropy in Benzene-l-¹³C

Gerhard Englert

Page range: 715-716

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Abstract

The 13 C-NMR spectrum obtained by the pulsed Fourier technique, of benzene-l-13 C oriented in a nematic liquid crys-tal was analysed. From the chemical shift difference between the nematic and isotropic phase a value for the 13 C chemical shift anisotropy in benzene-l-13 C of +190 ppm was determin-ed.

Open Access June 2, 2014

The Critical Solution Points of Some Hydro- carbons in Deuterated Nitromethane

Giorgio Spinolo, Paolo Ferloni

Page range: 716-717

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Open Access June 2, 2014

Zur Ermittlung Der Mechanischen Hysterese Rheologischer Körper

J Betten

Page range: 718-719

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Open Access June 2, 2014

Fließverhalten kompensierter cholesterisdier Mischungen / Flow Behaviour of Compensated Cholesteric Liquid-Crystal Mixtures

P. Pollmann

Page range: 719-720

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Abstract

Cholesterische Flüssigkeiten besitzen eine Schrauben-struktur, deren Drehsinn durch die Molekülstruktur des zugrunde liegenden Cholesterinesters bestimmt wird. Wie verschiedene Untersuchungen 1-3 zeigen, kann durch Mischen zweier cholesterisdier Komponen-ten entgegengesetzten Drehsinns eine Kompensation er-reicht, d. h. die Verschraubung aufgehoben und somit eine nematische Struktur erzeugt werden. Sonderdruckanforderungen an Dr. P. POLLMANN,

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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
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 27 Issue 4

Issue of Zeitschrift für Naturforschung A

Eine Approximation der Löwdinschen natürlichen Orbitale für Moleküle mit einer Green-Funktion-Methode

Abstract

Quasi-Equilibrium Theory of Ionic Fragmentation: Further Considerations

Abstract

Determination of a Static Hyperfine Interaction Following Recoil into Vacuum

Abstract

Mössbauer-Effekt am Fe57 in Additions-und Substitutionsverbindungen des Natrium-Nitrosylprussiates / Mössbauer-Effect in Fe57 of Addition and Substitution Compounds of Sodium Nitroprusside

Abstract

Level-Crossing-Experimente an einigen Heliumzuständen bei Ionenstoßanregung / Level-Crossing-Experiments on some He States excited by Ion Impact

Abstract

Level-Crossing-Experimente am bewegten Leuchten / Level-Crossing Experiments on High Velocity Atoms

Abstract

Sound Propagation in Dilute Polyatomic Gases

Abstract

Parametric Study of Functions of Molecular Vibrations

IV. Coriolis Coupling Constants for the Molecules XY2 and X3 (Symmetry C2V)

Abstract

Zum Rotations-Zeeman-Effekt in Dimethylketen / Molecular Zeeman Effect and the Determination of the Molecular g Values, Paramagnetic Susceptibilities, and Molecular Quadrupole Moments in Dimethylketene

Abstract

A Simple and Reliable Dye Laser System for Spectroscopic Investigations

Abstract

Thermal Properties of Alcaline-Earth-Oxides / III. Analysis of Anharmonic Effects

Abstract

Diffusion von Antimon in Gold

Abstract

Diffusion of He, Ne, and Ar in Vitreous and Partially Devitrified Germani um Dioxide

Abstract

Die Molekülstruktur des 3.3.6.6-Tetramethyl-1-thiacycloheptins (C10H16S) / The Molecular Structure of 3.3.6.6-Tetramethyl-1-Thiacycloheptine

Abstract

Photolyse des Äthylens im Bereich 147 — 193 nm / Ethylene Photolysis At 147 — 193

Abstract

Quantenchemische und spektroskopische Untersuchungen an Porphyrinen. III. Die Chlorine / Quantum Chemical and Spectroscopical Studies on Porphyrins. III. The Chlorins

Abstract

Bewegungen der CH3 -Gruppen in Methyl-Naphthalin-Kristallen

II. Quantitative Diskussion der Protonenspin-Relaxation / Rotation of Ch3 Groups in Methyl Naphthalene Crystals

Abstract

Zur Begrenzung der radial en Ausdehnung des Li chtbogenstromes durch ein axiales Magnetfeld. II. Skalengesetze und Vergleich mit Experimenten / On Limitation of the Radial Extent of the Arc Current by Means of an Axial Magnetic Field. II. Scaling Laws and Comparison with Experimental Results

Abstract

ortho-Effects in Mass Spectra. Alteration of the Molecular-Ion Energy Distribution in Disubstituted Acetanilides

Abstract

Massenspektrometrie am negativen Glimmlicht einer zylindrischen Hohlkathode / Mass Spectrometric Studies of the Negative Glow of a Cylindrical Hollow Cathode Discharge

Abstract

Untersuchungen an stromstarken Kapillarentladungen. Teil III: Spektroskopische Messungen / Investigations on High Current Capillary-Discharges. Part 111: Spectroscopic Measurements

Abstract

Molecular Force Fields of Tungsten and Uranium Hexachlorides

Abstract

Hyperfeinstruktur Des Csbr

Abstract

Rotationsspektrum des PN

Rotational Zeeman-Effect of [2,5-D2]-Furan

Über Ein Neues Radiofrequenz-Mikrowellen- Doppelresonanzexperiment

ESR, Dielectric and Optical Absorption of Manganese (II) Chloro Complexes in DMF and DMA Solution

Characteristics of a Tunable Travelling Wave Dye Ring Laser

Abstract

Abklingzeiten und Radiolumineszenzausbeuten von Styrenlösungen PPO im Polymerisations- prozeß

13C-NMR Chemical Shift Anisotropy in Benzene-l-13C

Abstract

The Critical Solution Points of Some Hydro- carbons in Deuterated Nitromethane

Zur Ermittlung Der Mechanischen Hysterese Rheologischer Körper

Fließverhalten kompensierter cholesterisdier Mischungen / Flow Behaviour of Compensated Cholesteric Liquid-Crystal Mixtures

Abstract

Mössbauer-Effekt am Fe⁵⁷ in Additions-und Substitutionsverbindungen des Natrium-Nitrosylprussiates / Mössbauer-Effect in Fe⁵⁷ of Addition and Substitution Compounds of Sodium Nitroprusside

IV. Coriolis Coupling Constants for the Molecules XY² and X³ (Symmetry C_2V)

Die Molekülstruktur des 3.3.6.6-Tetramethyl-1-thiacycloheptins (C₁₀H₁₆S) / The Molecular Structure of 3.3.6.6-Tetramethyl-1-Thiacycloheptine

Bewegungen der CH₃ -Gruppen in Methyl-Naphthalin-Kristallen

II. Quantitative Diskussion der Protonenspin-Relaxation / Rotation of Ch₃ Groups in Methyl Naphthalene Crystals

Rotational Zeeman-Effect of [2,5-D₂]-Furan

¹³C-NMR Chemical Shift Anisotropy in Benzene-l-¹³C