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1977 (292)
1Author    R. Honerjäger, R. TischerRequires cookie*
 Title    Magnetisches Dipolmoment der zweiatomigen (IVa/VIa)-Molekeln im -G rundzustand  
 Abstract    Magnetic Dipole Moments of Diatomic (IValVIa)-Molecules in their Ground State Rotational gj-factors of the following (IVa/VIa)-molecules have been measured: 72Ge32S : -0.06828(11), 120Sn80Se 0.03007(10), 74Ge80Se 0.03765(6), 120Sn130Te : -0.02212(13), 74Ge130Te : -0.03193 (10), -> o8Pb32S . _ 0.06440 (4), i2oSn32S ._ 0.06120(7), 208Pb80Se : -0.02764(7). The systematics of the rotational magnetic moments of class (IVa/VIa) -molecules are discussed. 
  Reference    (Z. Naturforsch. 32a, 1—5 [1977]; eingegangen am 25. November 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0001.pdf 
 Identifier    ZNA-1977-32a-0001 
 Volume    32 
2Author    U. Tiemann, J. Köhler, HoeftRequires cookie*
 Title     
 Abstract    On the Rotational Spectrum of InBr The hyperfine structure of the rotational transition / = 1 2 in the frequency range of 6.6 GHz was measured. The analysis yields the following quadrupole coupling constants: c Qv Q (115In) = [-634.62 + 2.52 (i>+l/2) ±0.45] MHz , eqvQ (79Br) = [110.38 + 0.50 (tf+1/2) ±0.50] MHz , eqvQ (81Br) = [91.88 + 0.45 (v+1/2) ±0.50] MHz . The new determinations are consistent with the systematic trends of the III/VII diatomic molecules and remove the discrepancies of the older measurements of Barrett and Mandel Z u m R o ta tio n s s p e k tr u m des In B r 
  Reference    (Z. Naturforsch. 32a, 6 [1977]; eingegangen am 30. November 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0006.pdf 
 Identifier    ZNA-1977-32a-0006 
 Volume    32 
3Author    Ivan Bosanac, GutmanRequires cookie*
 Title    Slobodan  
 Abstract    A graph theoretical method is developed which enables to calculate the contribution of a partic­ ular ring to the total .i-electron energy of a conjugated molecule. 
  Reference    (Z. Naturforsch. 32a, 10—12 [1977]; received November 20 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0010.pdf 
 Identifier    ZNA-1977-32a-0010 
 Volume    32 
4Author    D. Vogt, W. Dreves, J. MischkeRequires cookie*
 Title    I o n  
 Abstract    M o le k ü l-R e a k tio n e n u n d L a d u n g sa u sta u sc h bei S tö ß e n v o n C T a u f 0 2 Ion-Molecule Reactions and Charge Transfer in Collisions of 0~ on 02 Investigations of the cross section for the reaction 0" + 02->02-+ 0 have been made for labo­ ratory kinetic energies 0—100 eV. The reaction shows a sharp maximum in the cross section at low energies (5 eV lab.). By the use of the primary ion 180~ it can be shown that above 20 eV (lab.) there is only charge exchange whereas in the lower energy region ion-molecule-reactions as well as charge exchange occure. The reaction 0~ + 0»-*-0+ + . . . has also been observed above 27 eV (lab.). 
  Reference    (Z. Naturforsch. 32a, 13 [1977]; eingegangen am 25. November 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0013.pdf 
 Identifier    ZNA-1977-32a-0013 
 Volume    32 
5Author    P. Mandal, D. K. Bhattacharya, M. Saha, P. K. Sen, P. C. Bhattacharya, S. N. GhosalRequires cookie*
 Title    8L i E m issio n in  
 Abstract    8 G e V /c K -M e so n I n te r a c tio n s in N u c le a r E m u ls io n Out of about 16,000 stars found by an area scan of 1.8 GeV/c K"-meson interactions with emul­ sion nuclei, 120 'hammer tracks' have been collected. The corrected production rate is (1.30 ±0.12)^. The forward to backward ratio indicates isotropic emission of 8Li fragments. The emis­ sion of short recoils at the primary vertex shows a definite correlation with the 8Li fragments. 
  Reference    (Z. Naturforsch. 32a, 17—20 [1977]; received October 19 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0017.pdf 
 Identifier    ZNA-1977-32a-0017 
 Volume    32 
6Author    K. Erhardt, I. Meyer, P. StritzkeRequires cookie*
 Title     
 Abstract    h e E m issio n C o e ffic ie n t o f th e C o n tin u u m in a n A r g o n a n d N itr o g e n P la sm a a t H ig h T e m p e r a tu r e s The continuum emission of an argon-and nitrogen plasma developed in an electrical discharge has been investigated in the wavelength range from 3000 Ä to 6700 Ä. To this purpose the time-and radial dependent plasma parameters such as temperature and the total pressure have been determined in the high conducting stage of the spark by measuring several line intensities. The continuum coefficient was calculated from these data according to the Kramers-Unsöld theory. The comparison of the theoretical and the measured values shows deviations which are discussed. In the case of the argon continuum the f-factors for T — 14 000 K agree with the calculated values of Schlüter and the experimental ones of Schulz-Gulde. In the case of the nitrogen plasma the ^-fac­ tors have been determined in the temperature interval from 18 000 K to 45 000 K. Since at these temperatures the particles Nn-Niv contribute to the total continuum coefficient, the measured ^-factors can only be correlated to £n, £m, ... in a narrow temperature range. The measured cor­ rection factor f for X = 5050 Ä has been applied to determine the temperatures and the pressure of a laser produced spark. The plasma parameters agree with those determined by measuring the line-intensity of the Nii-line at 5000 A. 
  Reference    (Z. Naturforsch. 32a, 21—27 [1977]; received December 4 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0021.pdf 
 Identifier    ZNA-1977-32a-0021 
 Volume    32 
7Author    K. Heinz, P. Heilmann, K. MüllerRequires cookie*
 Title      
 Abstract    The intensity spectra of the superstructure diffraction spots of the clean platinum (100) surface are presented for normal or nearly normal incidence. Their gross features are interpreted in terms of multiple diffraction contributions. It is shown that most of the maxima in the spectra can be explained by double diffraction processes from an idealized pure hexagonal surface layer and quadratic bulk layers. Alternative models in which the surface layer exchanges already all occuring reciprocal lattice vectors would predict additional peaks which, however, do not arise. Therefore superstructure features of the surface layer are assumed to be of second order. Thus double dif­ fraction involving only idealized hexagonal and quadratic structures seems to dominate the diffraction behaviour of clean Pt(100). T h e D o u b le D if fr a c tio n M o d e l f o r L E E D -In te n s ity S p e c tra o f th e C le a n P t(1 0 0) S u rfa c e 
  Reference    (Z. Naturforsch. 32a, 28—32 [1977]; received December 2 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0028.pdf 
 Identifier    ZNA-1977-32a-0028 
 Volume    32 
8Author    Fred FischerRequires cookie*
 Title      
 Abstract    A solid elastic skin on a liquid surface aquires a periodic ripple formation when a compressive strain surpasses a critical value. From a calculation the ripple wavelength is found to be pro­ portional to the 3/4th power of the skin thickness. This instability can be described as a kind of second order phase transition, where a relative amplitude of the ripple wave is the order parameter. In addition, when the skin area is abruptly compressed the ripple wavelength depends on the magnitude of the compressive strain. Examples for skin rippling with wavelengths between 10 urn and 100 m are discussed. 
  Reference    (Z. Naturforsch. 32a, 33—39 [1977]; received December 4 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0033.pdf 
 Identifier    ZNA-1977-32a-0033 
 Volume    32 
9Author    H. G. Busse, B. HavsteenRequires cookie*
 Title      
 Abstract    The description of phenomena created by nonlinear oscillators with the aid of transformation groups has been attempted. Such a treatment of the chemical model of Dreitlein and Smoes was met with success. The mathematical approach is based on an application of the canonical form theorem for one-parameter groups. Conditions for the occurence of limit cycles have been derived. N o n lin e a r O s c illa tio n s in C h e m ic a l N e tw o r k s as S y m m e trie s o f T r a n s f o r m a tio n G ro u p s 
  Reference    (Z. Naturforsch. 32a, 40—46 [1977]; received October 2 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0040.pdf 
 Identifier    ZNA-1977-32a-0040 
 Volume    32 
10Author    E. Schuller, R. Claus, H. J. Falge, G. BorstelRequires cookie*
 Title     
 Abstract    o m p a r a tiv e F T R -a n d R a m a n s p e c tro s c o p ic S tu d ie s o f F u n d a m e n ta l M o d e F re q u e n c ie s in L i N b 0 2 a n d th e P re s e n t L im it o f O b liq u e P h o n o n D is p e rs io n A n aly sis The assignments of fundamental mode frequencies in LiNb03 determined by IR-and Raman scattering-experiments show some characteristic differences. Comparative frustrated total reflection (FTR) -and Raman scattering-studies were carried out in order to find the origin of these discrep­ ancies. The most serious deviation was due to the fact that in one case the ordinary phonon is ob-seived by Raman scattering whereas the extraordinary mode is recorded only by FTR. It has been shown, on the other hand, that the oblique phonon dispersion technique did not provide arguments for the correct assignments. The main limit of the method is due to the fact that the influence of exciton states on polaritons hitherto is taken into account only by a constant high frequency di­ electric 'function' (e^). The uncertainty in the choice of a suitable e^-value allows fittings of quite diverging sets of experimentally determined fundamental frequencies. 
  Reference    (Z. Naturforsch. 32a, 47—53 [1977]; received November 27 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0047.pdf 
 Identifier    ZNA-1977-32a-0047 
 Volume    32 
11Author    Th HeumannRequires cookie*
 Title     
 Abstract    e s tim m u n g p a rtie lle r D iffu s io n s k o e ffiz ie n te n in b in ä r e n L e g ie ru n g e n v o m S u b s titu tio n s ty p m it H ilfe d ü n n e r S c h e ib e n p a a re Determination of the Intrinsic Diffusion-coefficients of Binary Solid Solution Alloys with the Aid of Thin Plates A new method for determining intrinsic diffusion-coefficients in binary solid solutions of the substitutional typ is described. For this, thin plates are used having such a thickness that during annealing the specimen becomes nearly homogenious. From the shift of the original interface one obtaines the ratio of the intrinsic diffusion-coefficients for the concentration in the Kirkendall interface. 
  Reference    (Z. Naturforsch. 32a, 54—56 [1977]; eingegangen am 10. September 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0054.pdf 
 Identifier    ZNA-1977-32a-0054 
 Volume    32 
12Author    H.E Gunilla Knape, LenaM. TorellRequires cookie*
 Title      
 Abstract    Brillouin spectra of molten CsN03 were investigated for scattering angles between 40 and 140° and in a temperature interval of 420 — 520 °C. An Ar+ singlemode laser was used for excitation and the total instrumental width was ~265 MHz. The measured frequency shifts and linewidths of the Brillouin components were used to determine velocities and attenuations of thermal sound waves in the frequency range 2.3 — 7.0 GHz. A dispersion of 4 — 5% was found between the present hyper­ sonic velocities and reported ultrasonic velocities. A considerable decrease in attenuation with frequency was observed in the investigated frequency range, with the value at high frequency ap­ proaching the classical attenuation. The results are in good agreement with Mountain's theory of a single relaxation time. The relaxation time of the bulk viscosity coefficient was calculated to 1.2 X10-10 s. H y p e r s o n ic V e lo c ity , A b s o r p tio n a n d R e la x a tio n in M o lte n C s N O a 
  Reference    (Z. Naturforsch. 32a, 57—60 [1977]; received November 27 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0057.pdf 
 Identifier    ZNA-1977-32a-0057 
 Volume    32 
13Author    V. Graf, F. Noack, M. StohrerRequires cookie*
 Title      
 Abstract    In v e s tig a tio n o f O r d e r F lu c tu a tio n s , S e lf-D iffu sio n a n d R o ta tio n a l M o tio n s in th e N e m a tic L iq u id C r y s ta l M B B A b y ^ -R e l a x a t i o n S p e c tro s c o p y We report on measurements of the proton spin Tx relaxation dispersion at various temperatures in the nematic phase of the liquid crystal MBBA in the Larmor frequency range from 2 kHz to 270 MHz, which exceeds previous studies by more than 3 orders of magnitude. The new results cannot be interpreted in terms of either order fluctuations or self-diffusion as recently proposed by Doane et al.1 and Blinc et al.2, respectively. Instead, the dispersion and its temperature dependence indicate the significance of at least three relaxation mechanisms, namely order fluctuations (OF), self-diffusion (SD) and rotation of the molecular ellipsoids about the short axis (R). The com­ bined OF-SD-R model presented in this work allows a quantitative analysis of the experimental findings! The correlation times and activation energies of the three molecular reorientations eval­ uated from the 7\ dispersion by means of a computer optimization procedure are in essential agree­ ment with data provided by other spectroscopic methods [light scattering, tracer technique, dielec­ tric relaxation], but differ from former NMR conclusions. 
  Reference    (Z. Naturforsch. 32a, 61—72 [1977]; received November 23 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0061.pdf 
 Identifier    ZNA-1977-32a-0061 
 Volume    32 
14Author    A. PiltRequires cookie*
 Title     
 Abstract    The El decays from members of the lowest A>= 1/2" bands in 21Ne and 23Na are shown to exhibit remarkable, but dissimilar, patterns, which can be reproduced with a simple two-parameter expression. This may have useful application in identifying high-spin members of the £-T = l/2~ and 3/2+ bands in both nuclei. 
  Reference    (Z. Naturforsch. 32a, 73—75 [1977]; received November 25 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0073.pdf 
 Identifier    ZNA-1977-32a-0073 
 Volume    32 
15Author    A. K. Dublish, B. B. Srivastava, D. K. Sharma, U. P. Verma, A. N. PandeyRequires cookie*
 Title     
 Abstract    s e u d o -e x a c t F o rc e C o n s ta n ts f o r T e tr a m e th y ls o f G r o u p IV A M e ta ls a n d M o le c u la r F o rc e Fields f o r S om e T e tr a h e d r a l M o lecu les o r Io n s Recently reported Coriolis constants of tetrahedral tetramethyls of group IVA metals from the vapour phase IR spectra have been used to determine the pseudo-exact force constants with the aid of the point mass model. The symmetrized force constants for tetramethyls of group IVA and some tetrahedral molecules and ions have also been computed following thhe L-F approximation method. The results are compared with exact or pseudo-exact force constants and with those force constants obtained from different approximation methods. The validity of the method has been tested. 
  Reference    (Z. Naturforsch. 32a, 76—78 [1977]; received December 1 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0076.pdf 
 Identifier    ZNA-1977-32a-0076 
 Volume    32 
16Author    W.-D PerschmannRequires cookie*
 Title     
 Abstract    n te rs u c h u n g v o n L e v e l-C ro s s in g -S ig n a le n a n sch n ellen H e -A to m e n in in h o m o g e n e n M a g n e tfe ld e rn G. v. Oppen Investigation of Level-crossing Signals on High-velocity He-atoms in Inhomogeneous Magnetic Fields In level-crossing experiments on high-velocity atoms, the shape of the observed signals depends sensitively on inhomogeneities of the applied magnetic field. With regard to the interpretation of such signals, we investigated the magnetic-field dependence of He I-fluorescence light excited by He-ion-He-atom collisions. Due to the inhomogeneity of the applied magnetic field, the observed level-crossing signals have a distorted shape with an oscillating structure in the wings. Taking into account the motion of the excited atoms, the shape of the signals will be explained. 
  Reference    (Z. Naturforsch. 32a, 79 [1977]; eingegangen am 4. Dezember 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0079.pdf 
 Identifier    ZNA-1977-32a-0079 
 Volume    32 
17Author    Michio Kimura, NishidaRequires cookie*
 Title    Akira  
 Abstract    Population densities of the 4p and 5p levels of argon atoms were measured along a freejet centerline of partially ionized argon in a low density plasma wind tunnel. The measured axial distribution of the 4p[3/2] level population has been compared with a theoretical prediction using a modified Thomson's formula for the excitation cross sections. 
  Reference    (Z. Naturforsch. 32a, 84—87 [1977]; received October 22 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0084.pdf 
 Identifier    ZNA-1977-32a-0084 
 Volume    32 
18Author    F. Drissler, W. Hägele, D. Schmid, H. C. WolfRequires cookie*
 Title     
 Abstract    e la y e d E m issio n f r o m G re e n A lg ae " C h lo re lla p y r e n o id o s a " a t V a rio u s T e m p e r a tu r e s Comparative studies of prompt and delayed emission from whole cells of Chlorella pyrenoidosa are presented for various temperatures between 4.2 and 300 K. Prompt emission was excited with continuous light (wavelengths between 420 and 670 nm). Light pulses (duration 6.9 msec) have been used to excite delayed emission. Their wavelength had to be shorter than 600 nm for investiga­ tions at 77 K. A linear dependence of the delayed emission intensity on the excitation intensity at low tem­ peratures (4.2 and 77 K) favours a one-quantum-mechanism to be responsible for delayed light production. The response of the total intensities on temperature shows a similar behaviour for both types of emission up to 200 K. Above 200 K they behave quite differently. 
  Reference    (Z. Naturforsch. 32a, 88—95 [1977]; received November 19 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0088.pdf 
 Identifier    ZNA-1977-32a-0088 
 Volume    32 
19Author    M. S. DhillonRequires cookie*
 Title    N O T I Z E N Excess Volumes of Mixtures of Acetone, Chloroform, Carbon tetrachloride, 1,4-Dioxane and Tetrahydrofuran with o-Dichlorobenzene  
 Abstract    Excess volumes of mixtures of o-dichlorobenzene with acetone, chloroform, carbon tetrachloride, 1,4-dioxane, and tetrahydrofuran have been measured at 293.15 K as a func­ tion of composition. The excess volume data have been used to check the one-fluid theory of mixtures with van der Waals's and Guggenheim's equations of state. 
  Reference    (Z. Naturforsch. 32a, 96—97 [1977]; received November 12 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0096_n.pdf 
 Identifier    ZNA-1977-32a-0096_n 
 Volume    32 
20Author    M. S. DhillonRequires cookie*
 Title    Phase Diagrams of Binary Mixtures of Phenylenediamines and Dihydroxybenzenes  
 Abstract    Solid — liquid equilibria for o-phenylenediamine + re-sorcinol, m-phenylenediamine + pyrocatechol, + resorcinol and p-phenylenediamine + pyrocatechol, + resorcinol have been studied by the thaw-melt method. The types and melting temperatures of the complexes formed in theses mix­ tures were ascertained from the phase diagrams. 
  Reference    (Z. Naturforsch. 32a, 98—100 [1977]; received November 12 1976) 
  Published    1977 
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 TEI-XML for    default:Reihe_A/32/ZNA-1977-32a-0098_n.pdf 
 Identifier    ZNA-1977-32a-0098_n 
 Volume    32 
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