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Volume 23 Issue 6

Issue of Zeitschrift für Naturforschung A

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Journal Overview

Open Access June 2, 2014

Mutual Gravitational and Collisional Scattering of Bodies in the Asteroid Belt

G. W. Wetherill

Page range: 791-795

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Abstract

A calculation is made of the cumulative effect of numerous small orbital perturbations caused by gravitational and collisional deflections of meteorites by other bodies in the asteroid belt. It is found that in a time equal to the age of the solar system the mean change in perihelion distance caused by gravitational perturbation is of the order of 10 -4 A. U. This phenomenon is consequently of negligible importance in removing meteorites from the asteroid belt. This conclusion is in disagreement with a result reported in the recent literature. The calculated mean change in perihelion distance caused by multiple collisional scattering is somewhat higher, about 10 -3 A. U. It is conceivable that a small fraction of very strong objects such as iron meteorites in highly inclined and eccentric orbits may be deflected into Mars-crossing orbits by this mechanism.

Open Access June 2, 2014

Oscillographic Polarography in Molten Nitrates

I. The Behaviour of the Ions Tl⁺, Cd⁺⁺, Pb⁺⁺, Zn⁺⁺ and Ni⁺⁺ in the Eutectic LiNO₃-NaNO₃—KNO₃O₃

M. Francini, S. Martini

Page range: 795-799

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Abstract

The polarographic investigation of Pb ++ , Cd ++ , Τl + , Zn ++ and Ni ++ ions in a KNO 3 -LiNO 3 -NaNO 3 molten eutectic mixture was carried out by conventional and oscillographic (single-sweep) polarography. Experiments were carried out in the temperature range 150 —200 °C, with a dropping mercury electrode as the cathode and a Ag/AgCl electrode as anode and reference. For ions with reversible behaviour (Cd + , Pb ++ , Tl + ) the polarographic diffusion coefficients calculated from conventional polarography data by means of the Ilkovič equation agree, within experimental errors, with those obtained from oscillographic data by the Randles-Sevčik equation at low potential change rates. At higher potential change rates deviations of the experimental peak currents from their theoretical values were observed. This is associated with a marked distortion of the wave and indicates a certain degree of kinetic control. The temperature dependence of the diffusion coefficients in the investigated range is the same for the ions with reversible behaviour and the corresponding activation energy is E= — 8.4 kcal/mole.

Open Access June 2, 2014

Non-Stationary E. M. F. Measurements after Polarization of Solid Galvanic Cells. The Stability of NbO

Giovanni B. Barbi

Page range: 800-804

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Abstract

The open-circuit electrical potential of the solid galvanic cell : was measured between 1000 and 1400 °K. The measurements were carried out both in stationary and in non-stationary conditions after cathodic polarization of the Nb—NbO electrode, recording the e. m. f. decay curves. A comparison between the two sets of results was made and the conditions which assure the reliability of the tensiometric measurements under non-stationary technique were stated. The standard free energy of formation of niobium monoxide was then calculated from the experimental data. The discrepancies with the literature values of the standard enthalpy and entropy of formation were interpreted in terms of a significant homogeneity field of stability of the NbO phase.

Open Access June 2, 2014

On the Fluctuation Model of Diffusion in Liquid Metals

R. A. Swalin

Page range: 805-813

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Abstract

In this paper further considerations has been given to the fluctuation model of diffusion, and equations have been derived which express the self-diffusivity of liquid metals as a function of temperature and pressure. For liquid metals which are characterized by pair potentials which are relatively deep compared with k T, D is predicted to vary in a linear fashion with T at constant volume. At constant pressure, the apparent activation energy is predicted to be equial to R T+R(β/β)T 2 where β is the isothermal compressibility and β' is its temperature derivative. Further, the variation in the logarithm of D with respect to pressure is predicted to be equal to [ (1/2.3)β] (∂β/∂P) T . A test of the equations for liquid mercury shows good correlation between theory and experiment. For liquid metals which are characterized by a shallow well in terms of the pair potential, no simple statements can be made concerning the nature of the temperature dependence, and simple approximations cannot be made. A test of the derived equations is made for liquid sodium which fits this case and for which good pair potential data exist, and good agreement is obtained at 373 °K. The temperature dependence of D as a function of T at constant volume is derived, but cannot be tested because of insufficient experimental data. The case of thermodiffusion is discussed, and it is shown that experimental values of the heat of transport are consistent with predictions of the theory.

Open Access June 2, 2014

Isotopenaustausch-Untersuchungen an Silicat-Ionenaustauschern

VI. Untersuchung des Ba-Isotopenaustauschs zwischen Zeolith A und wäßriger Lösung bei Temperaturen bis 180 °C mit Hilfe einer neuen experimentellen Methode

E. Hoinkis, H. W. Levi

Page range: 813-817

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Abstract

A method has been developed to measure the rate of rapid heterogeneous ion exchange reactions between powdered solids and an aqueous solution within the temperature range from 100 to 180 °C. The principle of this method is the following: Both the preheated solid and the preheated aqueous solution are brought into contact by breaking a container. After an exchange period of ≧ 10 sec the process is interrupted within a time intervall of 0.2 sec by splashing cold alkohol ( — 115 °C) into the reaction vessel. By means of this “temperature-jump”-method the isotopic exchange in Ba-zeolite A has been investigated. The diffusion process was found to be not uniform at temperatures up to 100 °C just as already had been shown for Cs difussion in Zeolith A. Above 100 °C, however, it appears to become an ideal diffusion process exactly obeying the solution of the diffusion-equation for the relevant case over the entire range of the process.

Open Access June 2, 2014

Zeeman and Dipolar Nuclear Relaxation by Paramagnetic Impurities in CaF₂

R. Van Steenwinkel, P. Zegers

Page range: 818-822

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Abstract

The relaxation times of Zeeman and dipolar energies have been measured in a single crystal of CaF 2 containing Ce impurities at very low concentration. Measurements have been made at various temperatures between 4.2 °K and 77 °K. It is shown that the Zeeman energy relaxation passes from a rapid spin diffusion to a diffusion limited case when the temperature is increased whilst the dipolar energy relaxation seems to be diffusion limited over the whole temperature range.

Open Access June 2, 2014

Die Frequenzabhängigkeit der longitudinalen Protonenrelaxationszeit von Benzol an Natriumchlorid

D. Michel, H. Pfeifer, B. Todt

Page range: 823-826

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Abstract

By means of NMR- and EPR-spectroscopy we investigated the system benzene-sodium chloride. Using spin-echo techniques the proton relaxation time T 1 of the sorbed benzene has been measured as a function of proton resonance frequency in the interval between 10 kHz and 24 MHz for different temperatures (7 °C, 25 °C, 50 °C) . The benzene content was 0.16 g/ (g adsorbent) on ground and dried sodium chloride with a specific surface area of 0.1 m 2 /g. The two dispersion regions near frequencies of ω I /2 π = 24 MHz and ω I /2 ηπ = 460 kHz can be explained by magnetic proton-electron- and magnetic proton-proton-interaction respectively. In agreement with EPR-mea-surements the high-frequency step gives a transverse electron spin relaxation time τS2=1.1·10 -11 s of the paramagnetic impurities, while the relatively long correlation time τCA=3.5·10 -7 s from the low-frequency step can be connected with the stochastic reorientation of the benzene molecules adsorbed on active centers. A rough estimation of the activation energy for τCA yields a value of 1.4 ... 2.7 kcal/mole.

Open Access June 2, 2014

Innermolekulare Beweglichkeit von Dicarbonsäureestern und dielektrische Relaxation

R. Nasuhoglu

Page range: 827-831

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Abstract

An der homologen Reihe der Diäthylester und einigen verwandten Molekülen wurde ε″ zwischen 30 und 0,7 cm Luftwellenlänge in verdünnter Benzollösung gemessen. Dem so ermittelten Teil der Absorptionskurve läßt sich ein Relaxationszeitspektrum nach Fröhlich zuordnen, dessen Mittelwert für Bernsteinsäurediäthylester größer als bei allen anderen Homologen ist. Das geht parallel zu einem besonders niedrigen molekularen Dipolmoment und wird als innere sterische Behinderung der Rotation von polaren Gruppen gedeutet. Bei Dicyclohexyl- und Dibenzyloxalat sind die Absorptionskurven unsymmetrisch, woraus auf die Beteiligung von sehr kurzen Relaxationszeiten an der Dipolorientierung geschlossen wird.

Open Access June 2, 2014

New Measurements of the Infrared Spectrum of H₂S₂ and D₂S₂ and Evaluation of the Molecular Force Field

Brenda P. Winnewisser, Manfred Winnewisser

Page range: 832-839

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Abstract

The infrared spectrum of H 2 S 2 has been reviewed in the range 4000 to 250 cm -1 and the spectrum of D 2 S 2 has been measured for the first time. No change in the basic assignment of the fundamental bands of H 2 S 2 has been made, although the stretching fundamentals and the combination bands can be more precisely assigned on the basis of the new information. With the six fundamental frequencies of H 2 S 2 and the two asymmetric fundamental frequencies of D 2 S 2 , calculations were made to determine as fully as possible the general valence force field. It was found that only the diagonal force constants could be determined on the basis of the available data: FSH = 4.08 - 4.09 md/Å, F a = 0.83 - 0.85 md A/rad 2 , FSS = 2.52 -2.62 md/Å, Ft = 0.0926 md Å/rad 2 .

Open Access June 2, 2014

Die Fluoreszenz- und Phosphoreszenzspektren der Phenanthroline

H.-H. Perkampus, A. Knop, J. V. Knop

Page range: 840-848

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Abstract

Mit Hilfe der Fluoreszenz-, Fluoreszenzanregungs- und Phosphoreszenzspektren sowie der APF-, APPh-, FP- und PhP-Spektren wurde eine Zuordnung der Elektronenübergänge für die 10 isomeren Phenanthroline vorgenommen. Dabei zeigte sich wie in vorhergehenden Arbeiten, daß für die spektroskopischen Eigenschaften nicht die Symmetrie der Verbindungen, sondern nur die gegenseitige Stellung der beiden N-Atome in den äußeren Ringen entscheidend ist. Die Schwingungsübergänge für den Grund- und Anregungszustand werden diskutiert.

Open Access June 2, 2014

Zur Desaktivierung der angeregten Zustände bei den Phenanthrolinen

H.-H. Perkampus, A. Knop

Page range: 849-852

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Abstract

Aus dem genau zu bestimmenden Verhältnis der Quantenausbeuten der Phosphoreszenz und Fluoreszenz und den Phosphoreszenzabklingzeiten wird die Größenordnung der Geschwindigkeitskonstanten für die strahlungslosen Interkombinationsübergänge S 1 → T 1 und T 1 → S 0 abgeschätzt. Unter Verwendung der bekannten Quantenausbeuten des Phenanthrens werden ferner die Quantenausbeuten der Phosphoreszenz und Fluoreszenz für die Phenanthroline abgeschätzt.

Open Access June 2, 2014

Dodekaeder und Archimedisches Antiprisma als Molekülstrukturen bei Oktacyanokomplexen des Molybdän(IV) und Wolfram(IV)

Edgar König

Page range: 853-860

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Abstract

Infrared spectra (300—4000 cm -1 ) have been measured on the octacyanide complexes K 4 Mo (CN) 8 ·2H 2 O and K 4 W (CN) 8 ·2 H 2 O in aqueous solution, in the solid dihydrates, and in the solid anhydrous compounds. Comparison with relevent Raman data, particularly in the 2100 cm -1 region, provides conclusive evidence for the effective molecular symmetry of the M (CN) 8 4- group in the different surroundings. In aqueous solution, the ions [Mo (CN) 8 ] 4- and [W (CN) 8 ] 4- assume the symmetry of an Archimedean antiprism, D 4d . In the dihydrate crystals, the groups Mo (CN) 8 4- and W (CN) 8 4- approach the full D 2d symmetry of a dodecahedron with triangular faces, possibly slightly distorted by packing effects. In the anhydrous compounds, the symmetry of these groups is considerably lower, very likely C 8 . Reasonable assignments for all normal frequencies in the 2100 cm -1 region are proposed, both in D 4d and D 2d symmetry.

Open Access June 2, 2014

Die Änderung der Wärmeleitfähigkeit von ferromagnetischen Nickel-Kupfer-Legierungen im Magnetfeld

R. Burger, H. Dittrich, K. M. Koch

Page range: 861-866

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Abstract

Die Änderung der Wärmeleitfähigkeit λ von Ni und Ni—Cu-Legierungen im Magnetfeld verläuft unterhalb der magnetischen Sättigung völlig parallel zur Änderung der elektrischen Leitfähigkeit σ. Oberhalb der Sättigung nimmt λ sowohl bei H parallel als auch bei H senkrecht zum Wärmestrom mit zunehmendem H ab, wogegen σ zunimmt. Dieser Effekt wird mit dem experimentell beobachteten Anstieg von λ oberhalb des Curie-Punkts und mit der magnetischen Beeinflußbarkeit der spez. Wärme in Zusammenhang gebracht.

Open Access June 2, 2014

Experimentelle Untersuchungen an einem Wasserstoff-Lichtbogen im achsenparallelen Magnetfeld. I.

C. Mahn, H. Ringler, G. Zankl

Page range: 867-873

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Abstract

In a stationary high density d. c. arc, the electric power input is balanced essentially by heat conduction losses in radial direction. These losses increase greatly with temperature and thus they limit the axial temperatures attainable with reasonable power input. An experiment is described in which considerably higher plasma temperatures have been obtained by reducing the coefficient of heat conduction with a superimposed axial magnetic field. At arc currents of about 2 kA and a magnetic field of 10 kG temperatures in the middle of the arc of the order of 10 eV were reached. The measured temperature, pressure and power input of the hydrogen plasma are compared with calculated values. In particular, the coefficient of heat conduction perpendicular to a magnetic field has been determined by measuring the radial temperature profile and the electric field strength. The results agree with theoretical predictions.

Open Access June 2, 2014

Experimentelle Untersuchungen an einem Wasserstoff-Lichtbogen im achsenparallelen Magnetfeld.: II. Feldstärke und Geschwindigkeitsmessungen mit Potentialsonden

C. Mahn, H. Ringler, G. Zankl

Page range: 874-880

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Abstract

The axial and radial components of the electric field in a hydrogen arc with superimposed axial magnetic field have been measured with potential probes. The axial field was found to be only 3.1 V/cm, whereas in the radial direction fields up to 400 V/cm indicate a rotation of the arc. Radial fields are caused by υ x 23 e. m. forces due to this rotation. The probe measurements indicate velocities of the order of 10 6 cm/sec which are confirmed by Doppler shift measurements. A simple model is considered in which Lorentz forces cause a rotation of the arc; calculations are in agreement with the measurements. Axial velocities (2 · 10 4 cm/sec) have also been determined, by measuring the velocity of a perturbation due to the probe. This perturbation travels downstream in the arc and is observed as a small drop in the arc voltage passing the anode region.

Open Access June 2, 2014

Die Spektroskopie des Wasserstoffmoleküls in der Nähe seiner Ionisierungsgrenze

F. J. Comes, H. O. Wellern

Page range: 881-887

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Abstract

The absorption and ionization cross sections of molecular hydrogen for the wavelength region from 850 to 792 A are given. This region contains the dissociation and ionization limit as well. The rotational structure of the bands could partially be resolved in this experiment. As the dissociation of the molecule results in an excited hydrogen atom, this process can be followed by measuring the atomic fluorescence. Part of the excited atoms is found to be in the metastable 2 2 S-state. From fluorescence as well as absorption and ionization measurements it can be shown, that even above the ionization limit the absorption due to the D-state of the molecule leads to dissociation. The experimental results seem to point out, that the spectroscopic value of the ionization limit has to be shifted to lower energies.

Open Access June 2, 2014

Methode zur Bestimmung des Anfangstransportes bei Trennrohren mit Entnahme

E. Trötsch, G. Dickel, H. Fritzsche

Page range: 888-891

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Abstract

Es wurde das Verhalten einer Trennrohrstaffel theoretisch und experimentell untersucht, bei der an einer Stelle die Breitenfunktion gegen das Entnahmeende hin zunimmt. Dieser Sachverhalt hängt eng mit dem Effekt zusammen, daß bei großen Entnahmen unter Umständen der Konzentrationsgradient in der Längsrichtung in Teilen der Anlage seine Richtung umkehren kann. Es zeigt sich, daß man daraus eine exakte Methode zur Bestimmung des Anfangstransportes herleiten kann.

Open Access June 2, 2014

Diffusion und Druckdiffusion in Gasen bei hohen Drucken

Joachim Richter

Page range: 892-897

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Abstract

Betrachtet werden zwei druckfeste Kammern, die durch eine Kapillare miteinander verbunden sind und mit einem Gasgemisch aus zwei Komponenten verschiedener Konzentration gefüllt sind. Der Konzentrationsunterschied ruft Diffusion hervor, die durch die damit verbundene Schwerpunktsverschiebung und durch den Einfluß der Kapillare mit der Zeit einen Druckunterschied aufbaut. Die dadurch verursachte Druckdiffusion wirkt der Diffusion entgegen. Es wird die Möglichkeit aufgezeigt, den Diffusionskoeffizienten und den Druckdiffusionskoeffizienten aus einem Experiment zu bestimmen. Das Problem wird unter Vorgabe von drei verschiedenen Konzentrationsverteilungen zu Beginn des Versuchs berechnet. Es wird ferner gezeigt, daß unter gewissen Annahmen diese verschiedenen Anfangsbedingungen keinen Einfluß auf das Ergebnis haben. Diffusions-, Druckdiffusionskoeffizient, partielles Molvolumen und Molvolumen der Mischung werden bei der Berechnung als unabhängig von Zusammensetzung und Druck angenommen.

Open Access June 2, 2014

Influence of a Magnetic Field on the Spin-Diffusion in a Gas

S. Hess

Page range: 898-901

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Abstract

On the basis of the Waldmann equation for neutral particles with spin, the influence of a homogeneous magnetic field on spin-diffusion in a gas has been studied. The spin-diffusion constant for the components of the magnetic moment perpendicular to the external field is decreased. Furthermore a transverse spin-flux is found which leads to a shift of the resonance frequency if the magnetization is spatially inhomogeneous. Both effects vanish at high densities.

Open Access June 2, 2014

On the Field Theoretic Functional Calculus for the Anharmonic Oscillator III

W. Schuler, H. Stumpf

Page range: 902-917

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Abstract

The theory of solution for quantum field functional equations is developped for a suitable testproblem of quantum mechanics. In Sect. 1 the functional formulation of the anharmonic oscillator in its spinorial representation is given, and in Sect. 2 translational equivalent functional equations are discussed. The expansion of the physical state functionals into series of basefunctionals and the symmetrical representation of the functional equations for such an expansion is discussed in Sect. 3. In the following Sect. 4 the special symmetric orthogonal Hermitean functionals are used and the explicit representation is derived. In Sect. 5 the functionals are approximated by expansions with only a finite number of terms and the resulting equations are prepared for integration and in Sect. 6 a necessary condition of stationarity is considered. In Sect. 7 the simplest equation for N=1 is discussed in detail and the lowest eigenvalue is obtained. In the appendices technical details are derived.

Open Access June 2, 2014

HFS-Nullfeld-Elektronenspinresonanz an CH-Radikalen

M. Birkle, G. Schoffa

Page range: 918-926

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Abstract

HFS-Nullfeldresonanz ist Elektronenspinresonanz im Feld eines Kernspins ohne äußeres Magnetfeld. Sie bietet eine Möglichkeit, den Hyperfeinkopplungstensor, d. h. die Konstanten der magnetischen Kopplung zwischen Elektronenspin und Kernspin, direkt aus dem Nullfeldspektrum der polykristallinen bzw. amorphen Substanz zu bestimmen. Die Übergangsfrequenzen liegen z. B. bei Kopplungen zu Protonen im Bereich bis ca. 200 MHz. Es wird hier der Aufbau eines Nullfeldspektrometers für Frequenzen zwischen 12 MHz und 80 MHz beschrieben. Die Anwendungsmöglichkeiten der HFS-Nullfeldresonanz werden an Hand von Messungen an bestrahlten Substanzen diskutiert, wobei in den vorliegenden Fällen die Aufklärung der Strahlenschäden im Vordergrund steht.

Open Access June 2, 2014

The Electrical Conductivity of (Tl-Rb)NO₃ and (Na-Rb)NO₃

Vittoriano Wagner, Sandro Forcheri

Page range: 926-932

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Abstract

The electrical conductivity of molten (Na—Rb)NO 3 and (Tl—Rb)NO 3 was determined. While the equivalent conductivity of the first system shows the usual negative deviation from additivity, that of the second one varies nearly linearly with composition. After discussing the conductivity isotherms in terms of some proposed models, an excess conductivity isotherm is presented, derived on the basis of simple assumptions about the trend of both cationic mobilities.

Open Access June 2, 2014

BERICHT: Self-Diffusion in Molten Salts. A Comparison Between Diffusion Theories and Experimental Data

C.-A. Sjöblom

Page range: 933-939

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Abstract

A comparison between the available self-diffusion data on pure molten salts and the predictions by different liquid diffusion theories is made. It is found that the Arrhenius equation D=D 0 exp (— Q/R T) describes the experimental data equally well (or better) than any of the other theoretically predicted equations. The hole model prediction (Q=3.74 R T m ) is found to be inaccurate. The free volume model and the local density fluctuation models describe the data less well than the other models considered. The cubic cell model leads to a correct correlation between self-diffusion and kinematic viscosity for several salts (but not all).

Open Access June 2, 2014

Notizen: One-Center and Two-Center (Coulombic) Integrals with Double-Zeta Function

A. Ažman, E. Zakrajšek

Page range: 940-940

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Open Access June 2, 2014

Notizen: Konstanten der indirekten Kernspin-Kopplung in Cadmiumdimethyl

H. Dreeskamp, K. Hildenbrand

Page range: 940-941

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Open Access June 2, 2014

Notizen: Messung der transversalen Polarisation der dem β-Zerfall von ¹⁷⁰Tm nachfolgenden L-Konversionselektronen

H.-R. Naumann

Page range: 942-943

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Open Access June 2, 2014

Notizen: Einfluß von Laserstrahlung auf additiv verfärbte Natriumchlorid-Kristalle

H. Kuzmany, G. J. Ritter

Page range: 944-945

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Open Access June 2, 2014

Notizen: Kinetische Laser-Blitzspektroskopie organischer Moleküle

Alexander Müller

Page range: 946-948

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Open Access June 2, 2014

Notizen: Excitons in the Energy Loss Spectrum of KBr

P. Keil

Page range: 948-949

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Abstract

Electron energy loss measurements on polycrystalline KBrfilms are reported. Excitonic structure is found to be associated not only with the top valence band but also with deeper bands (K + 3p-level). The spin-orbit splitting of this state is resolved.

Open Access June 2, 2014

Notizen: Infrared Absorption Spectrum of Germanium Periodate

K. S. Vajandar, M. A. Nabar

Page range: 950-950

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Open Access June 2, 2014

Notizen: Über die Phosphoreszenz des N-(α-Naphthyl)- carbazols

M. Zander

Page range: 950-952

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Open Access June 2, 2014

Notizen: Scattering Cross Section of a Particle Beam

Michal Lenc

Page range: 952-953

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Open Access June 2, 2014

Notizen: Chemical Reactions Resulting from Heavy Particle Bombardment of Diamond

Edward J. Zeller, Gisela Dreschhoff

Page range: 953-954

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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 23 Issue 6

Issue of Zeitschrift für Naturforschung A

Mutual Gravitational and Collisional Scattering of Bodies in the Asteroid Belt

Abstract

Oscillographic Polarography in Molten Nitrates

I. The Behaviour of the Ions Tl+, Cd++, Pb++, Zn++ and Ni++ in the Eutectic LiNO3-NaNO3—KNO3O3

Abstract

Non-Stationary E. M. F. Measurements after Polarization of Solid Galvanic Cells. The Stability of NbO

Abstract

On the Fluctuation Model of Diffusion in Liquid Metals

Abstract

Isotopenaustausch-Untersuchungen an Silicat-Ionenaustauschern

VI. Untersuchung des Ba-Isotopenaustauschs zwischen Zeolith A und wäßriger Lösung bei Temperaturen bis 180 °C mit Hilfe einer neuen experimentellen Methode

Abstract

Zeeman and Dipolar Nuclear Relaxation by Paramagnetic Impurities in CaF2

Abstract

Die Frequenzabhängigkeit der longitudinalen Protonenrelaxationszeit von Benzol an Natriumchlorid

Abstract

Innermolekulare Beweglichkeit von Dicarbonsäureestern und dielektrische Relaxation

Abstract

New Measurements of the Infrared Spectrum of H2S2 and D2S2 and Evaluation of the Molecular Force Field

Abstract

Die Fluoreszenz- und Phosphoreszenzspektren der Phenanthroline

Abstract

Zur Desaktivierung der angeregten Zustände bei den Phenanthrolinen

Abstract

Dodekaeder und Archimedisches Antiprisma als Molekülstrukturen bei Oktacyanokomplexen des Molybdän(IV) und Wolfram(IV)

Abstract

Die Änderung der Wärmeleitfähigkeit von ferromagnetischen Nickel-Kupfer-Legierungen im Magnetfeld

Abstract

Experimentelle Untersuchungen an einem Wasserstoff-Lichtbogen im achsenparallelen Magnetfeld. I.

Abstract

Experimentelle Untersuchungen an einem Wasserstoff-Lichtbogen im achsenparallelen Magnetfeld.: II. Feldstärke und Geschwindigkeitsmessungen mit Potentialsonden

Abstract

Die Spektroskopie des Wasserstoffmoleküls in der Nähe seiner Ionisierungsgrenze

Abstract

Methode zur Bestimmung des Anfangstransportes bei Trennrohren mit Entnahme

Abstract

Diffusion und Druckdiffusion in Gasen bei hohen Drucken

Abstract

Influence of a Magnetic Field on the Spin-Diffusion in a Gas

Abstract

On the Field Theoretic Functional Calculus for the Anharmonic Oscillator III

Abstract

HFS-Nullfeld-Elektronenspinresonanz an CH-Radikalen

Abstract

The Electrical Conductivity of (Tl-Rb)NO3 and (Na-Rb)NO3

Abstract

BERICHT: Self-Diffusion in Molten Salts. A Comparison Between Diffusion Theories and Experimental Data

Abstract

Notizen: One-Center and Two-Center (Coulombic) Integrals with Double-Zeta Function

Notizen: Konstanten der indirekten Kernspin-Kopplung in Cadmiumdimethyl

Notizen: Messung der transversalen Polarisation der dem β-Zerfall von 170Tm nachfolgenden L-Konversionselektronen

Notizen: Einfluß von Laserstrahlung auf additiv verfärbte Natriumchlorid-Kristalle

Notizen: Kinetische Laser-Blitzspektroskopie organischer Moleküle

Notizen: Excitons in the Energy Loss Spectrum of KBr

Abstract

Notizen: Infrared Absorption Spectrum of Germanium Periodate

Notizen: Über die Phosphoreszenz des N-(α-Naphthyl)- carbazols

Notizen: Scattering Cross Section of a Particle Beam

Notizen: Chemical Reactions Resulting from Heavy Particle Bombardment of Diamond

I. The Behaviour of the Ions Tl⁺, Cd⁺⁺, Pb⁺⁺, Zn⁺⁺ and Ni⁺⁺ in the Eutectic LiNO₃-NaNO₃—KNO₃O₃

Zeeman and Dipolar Nuclear Relaxation by Paramagnetic Impurities in CaF₂

New Measurements of the Infrared Spectrum of H₂S₂ and D₂S₂ and Evaluation of the Molecular Force Field

The Electrical Conductivity of (Tl-Rb)NO₃ and (Na-Rb)NO₃

Notizen: Messung der transversalen Polarisation der dem β-Zerfall von ¹⁷⁰Tm nachfolgenden L-Konversionselektronen