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1976 (300)
201Author    H. SchlüterRequires cookie*
 Title    Resonanzverschiebungen in HF-Entladungen bei axialem Magnetfeld  
 Abstract    Resonance Shifts in High Frequency Discharges in Axial Magnetic Field Configurations The pressure dependence of the lower hybrid resonance is investigated in a hydrogen plasma generated by a high frequency discharge. Appreciable shifts of the absorption peak with the neutral gas pressure are observed only in a mirror like magnetic field configuration. The measurements show that this shift cannot be explained by a change of the ion composition of the plasma, but must be attributed to two other mechanisms: The composition of the spectrum of the kn-components is influenced by the axial electron density profile so that at low pressure the higher modes of the spectrum are dominant.With higher pressure the formation of radial modes is favoured which leads to an additional apparent shift of the resonance. 
  Reference    (Z. Naturforsch. 31a, 1122—1130 [1976]; eingegangen am 6. Juli 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1122.pdf 
 Identifier    ZNA-1976-31a-1122 
 Volume    31 
202Author    K. Behringer, P. ThomaRequires cookie*
 Title    Physikalisch-Technische Bundesanstalt, Institut Berlin  
 Abstract    The spectral radiance of a deuterium lamp has been cali-brated by the radiation of an electron synchrotron and by the continuum radiation of a high temperature hydrogen arc. The two measurements allow an indirect comparison of the two radiometric standards in the spectral range from 175 to 340 nm. They agree with each other within less than ± 5%. 
  Reference    (Z. Naturforsch. 31a, 1131—1132 [1976]; received July 25 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1131_n.pdf 
 Identifier    ZNA-1976-31a-1131_n 
 Volume    31 
203Author    M. SorgRequires cookie*
 Title    The Problem of Radiation Reaction in Classical Electrodynamics  
 Abstract    A new covariant theory of the classical radiating electron is compared with other radiation reaction theories: On the one hand, the new theory can be deduced from Caldirola's finite-dif-ferences theory by suitable approximations; on the other hand, the Lorentz-Dirac theory and the theory of Mo and Papas are shown to be approximative forms of the new theory. The latter is free from the difficulties of the other theories: there are no undetermined internal oscillations, no runaway solutions and pre-acceleration effects, and radiation reaction exists in the case of one-dimensional motion. The general energy-momentum balance is studied, and the implications of the existence of radiation reaction in a static constant force field are discussed with regard to the principle of equivalence. 
  Reference    (Z. Naturforsch. 31a, 1133—1142 [1976]; received July 26 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1133.pdf 
 Identifier    ZNA-1976-31a-1133 
 Volume    31 
204Author    M. SorgRequires cookie*
 Title    Electromagnetic Foundation of the Mo-Papas Theory  
 Abstract    Dirac's method for deriving an equation of motion of the radiating electron is used to deduce from Maxwell's theory the Mo-Papas equation in place of the Lorentz-Dirac equation. The emer-gence of the Schott term is avoided by means of a suitable assumption about the extension of the electron in space-time. Since one deals in this approach with a finite-size particle, no infinite terms arise in connection with the particle's mass. Moreover, asymptotic conditions are not necessary, neither in the derivation of the equation of motion nor in determining its solutions. 
  Reference    (Z. Naturforsch. 31a, 1143—1149 [1976]; received August 8 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1143.pdf 
 Identifier    ZNA-1976-31a-1143 
 Volume    31 
205Author    A. Brandão, '. Oliveira, H. Daniel, T. Von Egidy, F. J. HartmannRequires cookie*
 Title    A New Determination of the n Rest Mass  
 Abstract    The rest mass has been determined from measurements of X-ray transitions in pionic atoms, using muonic transitions for the calibration, to be m n -= 139.571 ± 0.010 MeV. A new upper limit for the ^«-neutrino rest mass was deduced: m v <0.78 MeV at 90 per cent confidence. 
  Reference    (Z. Naturforsch. 31a, 1150—1154 [1976]; received July 14 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1150.pdf 
 Identifier    ZNA-1976-31a-1150 
 Volume    31 
206Author    Requires cookie*
 Title      
 Abstract    Geometrodynamics This article is based upon the idea to solve the problem of combining the electromagnetic and the gravitational field by starting from Maxwell's theory. It is shown that the theory of the Maxwell field can be generalized in such a way that Einstein's theory of gravitation becomes a special case of it. Finally we find field equations which refer only to geometric quantities. 
  Reference    (Z. Naturforsch. 31a, 1155—1159 [1976]; eingegangen am 30. Juli 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1155.pdf 
 Identifier    ZNA-1976-31a-1155 
 Volume    31 
207Author    Rolf LauerRequires cookie*
 Title      
 Abstract    Emittance Diagrams and Aberrations of Electron Guns The aberration coefficients of electron guns are determined from experimental shadow curves. For this purpose the curves are mathematically described by parametric equations using the ray inclination at the cathode as a parameter. Since the shape of the shadow curves depends strongly on the grid potential, different methods are required to adapt the calculated curves to the measured curves. Using the coefficients of the mathematical representation together with measured values for the magnification between cross-over and cathode, spherical and angular aberration are calculated with an accuracy of about 20%. 
  Reference    (Z. Naturforsch. 31a, 1160—1167 [1976]; eingegangen am 1. Juli 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1160.pdf 
 Identifier    ZNA-1976-31a-1160 
 Volume    31 
208Author    OttoE. RösslerRequires cookie*
 Title    Chemical Turbulence: Chaos in a Simple Reaction-Diffusion System  
 Abstract    Nonperiodic oscillation ("chaos"), formerly found in several 3-variable homogeneous abstract reaction systems, is also possible in 2-morphogen compartmental systems. In a 2-cellular (and hence 4-variable) symmetrical morphogenetic system of Rashevsky-Turing type, a nonperiodic return toward an (almost) undifferentiated state is observed under numerical simulation. The system hereby shows a novel, "bi-chaotic" (rather than bistable), type of behavior. The 2 chaotic regimes are of the screw type each. They are separated by a symmetrical saddle-limit cycle. This behavior is preserved under a "contraction" of the system to 3 variables. A second bichaotic mode (2 spiral-type chaotic regimes separated by a symmetrical steady state) is also possible. A preliminary result on a third of chaos is also presented. Thus, "turbulence" (or chaos) may be a general behavioral possibility of interaction-type morphogenetic systems. 
  Reference    (Z. Naturforsch. 31a, 1168—1172 [1976]; received August 10. 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1168.pdf 
 Identifier    ZNA-1976-31a-1168 
 Volume    31 
209Author    H. Feucht, U. Haeberlen, M. Pollak-Stachura, H. W. SpießRequires cookie*
 Title    Multiple Pulse Proton Magnetic Resonance Study of KHCO3 and KHS0 4  
 Abstract    Single crystals of KHC03 and KHS04 have been investigated by solid state high resolution proton magnetic resonance techniques. These compounds may be considered as model systems for compounds that contain abundant quadrupolar nuclei (39 K) with small magnetogyric ratio in ad-dition to the protons. Despite considerable line broadening resulting from 1 H-39 K dipole-dipole coupling, all four possible proton shielding tensors in KHS04 , and an averaged shielding tensor for the two different proton sites in KHCO;} could be measured accurately. The results are analysed to determine the degree of ionization of the protons in the three types of hydrogen bonds occuring in KHC03 and KHS04. 
  Reference    (Z. Naturforsch. 31a, 1173—1180 [1976]; received August 3 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1173.pdf 
 Identifier    ZNA-1976-31a-1173 
 Volume    31 
210Author    M. Suzuki, A. Guarnieri, H. DreizlerRequires cookie*
 Title    Some Radiofrequency-Millimeterwave-Double Resonance Experiments, Partly with HFS-levels  
 Abstract    We report double resonance experiments with a broad range of pump frequencies up to 3.9 GHz and millimeter wave signal frequencies up to 160 GHz. It is demonstrated by the HFS of a rotational band head that these experiments provide a useful tool for analysing complex spectra in the range below 4 GHz. 
  Reference    (Z. Naturforsch. 31a, 1181—1189 [1976]; received July 3 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1181.pdf 
 Identifier    ZNA-1976-31a-1181 
 Volume    31 
211Author    D. Schweitzer, K. H. Hausser, R.G H Kirrstetter, H. A. StaabRequires cookie*
 Title    Transanular Interaction in [2.2]Phanes: [2.2](2,7)Pyrenophane  
 Abstract    The emission spectra of [2.2] (2,7) pyrenophane and the zero field splitting parameters D und E of its excited triplet state were measured in glasses and in small single crystals at 1.3 K. The results are being compared with monomer pyrene and 2,7-dimethylpyrene in liquid and solid solutions as well as in single crystals. 
  Reference    (Z. Naturforsch. 31a, 1189—1192 [1976]; received August 26 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1189.pdf 
 Identifier    ZNA-1976-31a-1189 
 Volume    31 
212Author    P. Frank, L. KraussRequires cookie*
 Title    Ermittlung der Dissoziationsenergie von AIO über die Normtemperaturmethode  
 Abstract    An Al vapour cloud (~1 ug) is generated between Al electrodes of a 10 kV transient spark (1 jus duration) in an environmental atmosphere of pure oxygen. During the cooling-down period of the so formed Al/O-plasma, the reaction Al + O + M -> AlO + M is observed. It can be shown that the conditions within the limited reacting gas volume may be considered as quasi-stationary and hence the laws of chemical equilibrium for computing number densities of atoms and molecules may be applied. The emissivity £rel (radiation per unit volume) of the AlO B -> X system at 4842 A and the gas temperature of the decaying plasma are recorded in terms of a laboratory time scale. The maximum of f r el (normalized maximum) may be correlated to the dissociation energy of AlO, yielding 5.17 ±0.3 eV. Effects of dilution, the pressure influence as well as the vibrational relaxation of AlO during its formation are considered and included in the calculations. 
  Reference    (Z. Naturforsch. 31a, 1193—1202 [1976]; eingegangen am 3. Juli 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1193.pdf 
 Identifier    ZNA-1976-31a-1193 
 Volume    31 
213Author    Willi Janiesch, Helmut Ulrich, Peter HessRequires cookie*
 Title    Vibrational Energy Transfer in Silane and Silane Mixtures  
 Abstract    The vibrational relaxation time for pure SiH4 is 0.10, 0.083 and 0.072 ^sec atm (±30%) at 295 K, 375 K and 462 K. For SiH4 diluted in He, D2 and H2 the corresponding numbers are 0.16, 0.081 and 0.031 /usee atm (+ 30%) at 295 K. The binary two-level theory has been used to deter-mine the four V —R, T rates in the system SiH4 —CH4, and the rate for V—V exchange between SiH4 and CH4 from experimental data. From the Schwartz-Slawsky-Herzfeld-formula for V —T and V —V, T processes an equation is derived describing V —R and V —V, R energy exchange. The dif-ferent models are compared with experimental data, especially with those found for the system SiH4 —CH4. 
  Reference    (Z. Naturforsch. 31a, 1203—1209 [1976]; received July 31 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1203.pdf 
 Identifier    ZNA-1976-31a-1203 
 Volume    31 
214Author    W. Czieslik, J. Wiese, D. H. SutterRequires cookie*
 Title    The Molecular Zeeman-Effect in 1,3-Difluorobenzene and 3-Methylfurane  
 Abstract    The rotational Zeeman effect of 1,3-difluorobenzene and 3-methylfurane has been studied at magnetic fields close to 25 kG. From the splittings of the rotational transitions the diagonal ele-ments of the molecular g-tensors and the anisotropics of the diagonal elements of the magnetic susceptibility tensors have been determined as: 
  Reference    (Z. Naturforsch. 31a, 1210—1216 [1976]; received July 9 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1210.pdf 
 Identifier    ZNA-1976-31a-1210 
 Volume    31 
215Author    Giulio Paliani, Rosario Cataliotti, Antonio PolettiRequires cookie*
 Title    An LR. Spectroscopic Study of the Conformational Equilibrium in 2-Acetylfuran  
 Abstract    The conformational cis/trans equilibrium of 2-Acetylfuran has been studied by i.r. spectroscopy, in various physical states. This equilibrium is strongly influenced by the dielectric constant of the medium. The isomeric energy difference is very small as revealed by the insensitivity of the equi-librium position to temperature changes. 
  Reference    (Z. Naturforsch. 31a, 1217—1219 [1976]; received May 17 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1217.pdf 
 Identifier    ZNA-1976-31a-1217 
 Volume    31 
216Author    G. Fiatscher, K. Fritz, J. FriedrichRequires cookie*
 Title    Site Selection Spectroscopy in the Temperature Range 2 K and 300 K  
 Abstract    In this paper we show that there exist rather simple aromatic systems which show no line nar-rowing in their fluorescence at 2 K, when excited with narrow bandwidth. However, large inhomo-geneous line broadening is detected via a shift of the fluorescence bands with excitation energy. This inhomogenous broadening is attributed to a quasi-continuous site splitting, which is present up to about 240 K. The influence of high excess energy on the inhomogenous broadening is dis-cussed. 
  Reference    (Z. Naturforsch. 31a, 1220—1227 [1976]; received July 12 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1220.pdf 
 Identifier    ZNA-1976-31a-1220 
 Volume    31 
217Author    H. M. Heise, H. Mäder, H. DreizlerRequires cookie*
 Title    Rotation -Torsion -Vibration Interaction in the Rotational Spectra of Isotopic Species of Ethyl Cyanide  
 Abstract    The measurements of the ground state rotational spectra of CH3CH2C 15 N and CH3CD2CN were extended to calculate the centrifugal distortion coefficients Dj , DJK and DK • The rotation-torsion-vibration interaction for these molecules including the normal species CH3CH2CN was studied in the rotational spectra of the first excited state of the methyl torsion and the CCN-in plane deforma-tion. With respect to previous work a more detailed check of a model with five degrees of freedom comprising the overall rotation and the two lowest vibrations was possible. Potential parameters were fitted simultaneously to the splittings of the rotational transitions in the two lowest excited vibrational states of the three isotopic molecules. The coefficients V 3 and V 6 of the Fourier expansion of the hindering potential for the torsion and an interaction constant V'sc for the torsion and the CCN-in plane deformation were determined. Using these results it was possible to reproduce the frequencies of the torsional and CCN vibrations. With less success the torsional overtones could also be calculated. 
  Reference    (Z. Naturforsch. 31a, 1228—1241 [1976]; received July 14 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1228.pdf 
 Identifier    ZNA-1976-31a-1228 
 Volume    31 
218Author    M. Suzuki, A. GuarnieriRequires cookie*
 Title    Microwave Zeeman Spectrum, Electric Dipole Moment and Nuclear Quadrupole Tensor of Methyl Hypochlorite and d 3 -Methyl Hypochlorite  
 Abstract    The microwave-Zeeman spectra of CH 3 0 35 C1 and CD 3 0 35 C1 have been investigated with magnetic fields up to 25 kG. In addition to the Zeeman parameters, the electric dipole moment and the chlorine nuclear quadrupole tensor have been determined. 
  Reference    (Z. Naturforsch. 31a, 1242—1258 [1976]; received June 26 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1242.pdf 
 Identifier    ZNA-1976-31a-1242 
 Volume    31 
219Author    E. F. Pearson, B. P. Winnewisser, M. B. TruebloodRequires cookie*
 Title    Millimeter Wave Spectrum of Excited Vibrational States of Potassium Hydroxide, KOH and KOD  
 Abstract    Rotational transitions in the millimeter wave region are reported for a number of excited vibrational states of KOH and KOD. From an analysis of the /-dependence of the Z-type resonance interactions the separation of the I sublevels of several v x vj 0 states has been obtained. The cubic anharmonic contributions to ax and <x 2 were determined and the sign and isotopic variation of <x 2 are shown to be consistent with a nearly harmonic bending potential function. An re structure has been determined from the data using a calculated value for <x 3 . On the basis of the present data, a severely anharmonic bending potential function for KOH can be excluded. Our results are compared with those for the heavier alkali hydroxides. 
  Reference    (Z. Naturforsch. 31a, 1259—1267 [1976]; received July 28 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1259.pdf 
 Identifier    ZNA-1976-31a-1259 
 Volume    31 
220Author    K. Frank, P. HessRequires cookie*
 Title    Vibrational Energy Transfer in CHF 3 -Mixtures  
 Abstract    The vibrational relaxation times for pure CHF, and CHF3 diluted in H2, D,, Ar, Kr and Xe are 0.55; Ö.01, 0.025, 2.6, 4.8, and 5.6 /usee atm at 298 K. These measurements complete previous results obtained for the systems CHF3-He, Ne, Ar. Correlation of the rare-gas results according to SSH-theory shows that relatively small rotational contributions may be expected for the heavy collision partners Kr and Xe. 
  Reference    (Z. Naturforsch. 31a, 1268—1269 [1976]; received August 7 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1268_n.pdf 
 Identifier    ZNA-1976-31a-1268_n 
 Volume    31 
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