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1976 (300)
61Author    G. K. Pandey, H. DreizlerRequires cookie*
 Title    Microwave Spectrum of hexa-Deutero Dimethyl Selenide in the Ground and Excited Torsional States  
 Abstract    The ground state rotational spectra of 80 Se and 78 Se species of the hexadeutero dimethyl selenide have been measured in the region from 5 to 40 GHz. In both the cases, rotational and centrifugal distortion constants have been determined by a least square fit to about thirty transition frequencies. For the (CD3) 2 80 Se molecule, fourteen rotational transitions in the excited torsional states £==1, and v = \.2 were also recorded, out of which nine appeared as well resolved triplets. The potential barrier parameter V3 and the angle a between one of the 'top axes' and the 'b axis' have been determined by a least square fit of the mean value of the observed splittings in the v=l1 and 12 states. The methyl top moment of inertia Ia was kept fixed at 6.35 amu Ä 2 , which is half of the observed inertia defect in the molecule. 
  Reference    (Z. Naturforsch. 31a, 357—361 [1976]; received February 25 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0357.pdf 
 Identifier    ZNA-1976-31a-0357 
 Volume    31 
62Author    M. Cacciatore, M. CapitelliRequires cookie*
 Title    Non L.T.E. Properties of Quasistationary Oxygen Plasmas  
 Abstract    The non L.T.E. (local thermodynamic equilibrium) properties of optically thin and thick quasistationary oxygen plasmas have been calculated for the temperature range k T=0.5 —1.5 eV and for the electron density interval 10 8 —10 16 cm -3 , by using the collisional-radiative model of Bates, Kingston and McWhirther. The results include 1 the coefficients r0(i) and rl(i), which re-present the contribution to the population density of the ith quantum level from the continuum and from the ground state, respectively 2 the values of a and S, which are the collisional-radiative recombination and ionization coefficients, respectively. The accuracy of the present results is discussed in connection with the adopted plasma model and with the selection of the collisional cross sections for forbidden and allowed transitions. A discussion is also presented of the influence of the two low lying excited states of oxygen atoms (i.e. the states 2p 4 'D, 2p 4 'S) on the non L.T.E. properties of these plasmas. A satisfactory agreement is found with the calculations of Julienne et al. and with the experimental results of Jones. 
  Reference    (Z. Naturforsch. 31a, 362—368 [1976]; received March 3 * 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0362.pdf 
 Identifier    ZNA-1976-31a-0362 
 Volume    31 
63Author    F. Scappini, A. GuarnieriRequires cookie*
 Title    The Zeeman Effect in the Rotational Spectrum of Carbonyl Chloro Fluoride  
 Abstract    The rotational Zeeman effect of FC1CO is reported. The Chlorine nuclear ^/-factor, the molecular (^-factors, gaa > 9bb , and gcc » and the magnetic susceptibility anisotropics, (2 /aa— "Abb — Xcc) mole and (2 Xbb~Xcc—Xaa) mole , are obtained from the spectrum. Some derivative molecular quantities are calculated. 
  Reference    (Z. Naturforsch. 31a, 369—373 [1976]; received February 27 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0369.pdf 
 Identifier    ZNA-1976-31a-0369 
 Volume    31 
64Author    W. U. Stieda, E. Tiemann, T. Törring, J. HoeftRequires cookie*
 Title    Adiabatische Korrektur der Born-Oppenheimer-Näherung beim GeS und GeSe  
 Abstract    The rotational spectra of GeS and GeSe were measured in the frequency range of 66 GHz to 110 GHz with high precision. The breakdown of the Born-Oppenheimer approximation was observed for the rotational constant yol. With the known molecular 37-factor and the electric dipole moment the adiabatic part of the Born-Oppenheimer correction can be extracted from the primary observa-tion on y01. The adiabatic correction is very similar in both molecules but differs from the results in the earlier measurements on PbS. 
  Reference    (Z. Naturforsch. 31a, 374—380 [1976]; eingegangen am 10. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0374.pdf 
 Identifier    ZNA-1976-31a-0374 
 Volume    31 
65Author    JohnJ. White, IiiRequires cookie*
 Title    Numerical Investigation of High Temperature Expansions of the Specific Heat of the Heisenberg Model  
 Abstract    The ten-term high temperature expansion calculations by Baker et al. (1967) for the <2 = 3, 5 = 1/2, cubic lattice Heisenberg models have been investigated numerically. Critical values based on the ten-term series were unreliable, however graphical extrapolation yielded critical values with a consistent q dependence among the various results for the sc, fee, bcc, FM, and AFM models. The short range order, as measured by (Sx — Sc)/Ä, is greater for the AFM models than for the FM model. The estimate of 0.35 ±0.02 for (5^—Sc)/R of the sc-AFM model agrees with previous experimental work on CoBr2 • 6 H20 and CoCl2 • 6 H20. Results are presented on the slow conver-gence of the high temperature expansions. Extrapolation of the series is needed for £<0.1. Higher order corrections to the T~ 2 term are needed for TjTc<iS. The critical values for the 7(1/2) and H(\j2) models were interpolated to predict critical values for the sc and bcc Z7(l/2) models. 
  Reference    (Z. Naturforsch. 31a, 381—386 [1976]; received February 24 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0381.pdf 
 Identifier    ZNA-1976-31a-0381 
 Volume    31 
66Author    G. L. BorchertRequires cookie*
 Title    Precision Measurement of y-Ray Energies from the Decay of "Co, S0 Co, 137 Cs, 152 Eu, 153 Sm and i9sAu  
 Abstract    Energies of y-rays from the radioactive decay of 57 Co, 60 Co, 137 Cs, 152 Eu, 153 Sm and 198 Au have been measured relative to the 411.794 keV y-ray standard from the decay of 198 Au. The relative accuracy of the measurement is between 1.7 X 10-5 and 1.0 X 10~ 5 for £,,<900 keV. 
  Reference    (Z. Naturforsch. 31a, 387—389 [1976]; received February 25 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0387_n.pdf 
 Identifier    ZNA-1976-31a-0387_n 
 Volume    31 
67Author    S. Haussühl, D. Mateika, W. TolksdorfRequires cookie*
 Title    Elastische und thermoelastische Konstanten von Y3Fe5012-, Nd3Ga5012-und Sm3Ga5012-Granaten  
 Abstract    Elastic and thermoelastic constants of cubic Y3Fe5012-, Nd3Ga5012-, and Sm3Ga5012-garnets are measured hy ultra-sonic methods. The small differences of the elastic proper-ties within the group of gallium garnets are nearly quanti-tatively described by the r~ 4 -rule, thus indicating the domi-nant role of ionic bonds. These garnets exhibit a similar thermoelastic behaviour. A slight but significant depression of the elastic constants is observed in Y3Fe5012 . 
  Reference    (Z. Naturforsch. 31a, 390—392 [1976]; eingegangen im 14. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0390_n.pdf 
 Identifier    ZNA-1976-31a-0390_n 
 Volume    31 
68Author    L. C. Gomes, 0. DietzschRequires cookie*
 Title    Neutron Separation Energies of Zr Isotopes  
 Abstract    Q values are reported for (d, t) reactions on all the stable isotopes of zirconium. The neutron separation energies of 94 Zr and 96 Zr differ greatly (by 27.5 and 22.1 keV, respec-tively) from the values in the 1971 Atomic Mass Evaluation. These results combined with those from other authors seem to indicate that the 1971 values for the masses of 93 Zr and 93 Zr are in error. 
  Reference    (Z. Naturforsch. 31a, 393—394 [1976]; received February 25 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0393_n.pdf 
 Identifier    ZNA-1976-31a-0393_n 
 Volume    31 
69Author    G. Willems, K.+ — Ar, Krand XeRequires cookie*
 Title    Messung differentieller Wirkungsquerschnitte für die elastische Streuung von Kalium-Ionen an Edelgasen Differential Elastic Cross Section Measurements for  
 Abstract    The differential elastic cross sections for K + —Ar, Kr and Xe were measured in the energy range from 2.2 eV to 5.0 eV in the laboratory system and compared with those predicted by the theory of Kim and Gordon. The experimental well depths are smaller than predicted by this theory. 
  Reference    (Z. Naturforsch. 31a, 395—396 [1976]; eingegangen am 28. Januar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0395_n.pdf 
 Identifier    ZNA-1976-31a-0395_n 
 Volume    31 
70Author    B. R. OrtonRequires cookie*
 Title    A Model of the Structure of Liquid Antimony  
 Abstract    The interference function from liquid antimony at 600 °C, obtained by Waseda and Suzuki, has been reproduced using a model based on two hard sphere interference functions (packing density, 0.41 diameters 3.11 Ä and 2.33 Ä). Agree-ment obtained using the model is better than that existing between various independent diffraction measurements. 
  Reference    (Z. Naturforsch. 31a, 397—398 [1976]; received February 9 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0397_n.pdf 
 Identifier    ZNA-1976-31a-0397_n 
 Volume    31 
71Author    W. E. Howard, E. W. SchlagRequires cookie*
 Title    Sharp Resonances in Radiationless Transitions  
 Abstract    We have observed extremely sharp Doppler-free reso-nances in the measurement of molecular lifetimes of ex-cited states in the low pressure gas-phase of naphthalene. These resonances are seen at extremely low magnetic fields and have a width of only 3 Gauss. Their extreme sharpness of 2.8xl0 -4 cm~ 1 is within a factor of 2 of the natural width of the radiationless transition, and some 130 fold below the Doppler width of the state considered. Such sharp resonances should provide unique insights into the states and dynamics of radiationless processes. They are probably due to sharp field dependent changes in the non-radiative coupling strength of the spin-orbit transition into the triplet. 
  Reference    (Z. Naturforsch. 31a, 399—400 [1976]; received February 12 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0399_n.pdf 
 Identifier    ZNA-1976-31a-0399_n 
 Volume    31 
72Author    J. Ramette, H. W. DrawinRequires cookie*
 Title    Structure of Stark Broadened Hß Lines at low Electron Densities  
 Abstract    The profile of the hydrogen line emitted by a hydrogen low-temperature afterglow plasma has been measured at electron densities 1.8 '10 15 , 1-10 15 and 5-10 14 cm -3 by means of a 10-channel analyzer system with a spectral resolution of 0.1 A. All profiles showed weak plasma satellites suddenly appearing at wavelength distances which correspond to the electron plasma frequency and showing "satellite line wings" which slowly smooth out at larger wavelength distances. In the line core—where all quasi-static and ion dynamic theories predict a minimum — appeared an intensity maximum well separated from the closely spaced intensity shoulders. This new feature not yet predicted by line broadening theories and not yet observed by other experimentalists is probably due to low-frequency ion oscillations which couple with the excited atomic system. Such an effect would explain discrepancies between available Stark broadening theories and the mass-dependent structure of line profiles recently observed in other experiments. The effect may possibly be useful for measuring collective low-frequency oscillations in plasmas under very special conditions. 
  Reference    (Z. Naturforsch. 31a, 401—407 [1976]; received February 21 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0401.pdf 
 Identifier    ZNA-1976-31a-0401 
 Volume    31 
73Author    Klaus-Dieter Willamowski, OttoE. RösslerRequires cookie*
 Title    Geometry of Titration Systems An Application of Horn's Theory to the Determination of />K-Values  
 Abstract    n-step tritration, Horn-equation, reaction simplex, rate constants, geometry of reaction systems Following a brief summary of Horn's theory, the geometry of an n-step titration is presented. This suggests a simple and accurate method for the determination of pK-values from concentration measurements. Mathematically, the affine invariance of barycentric coordinates is exploited. Formal analogies between titration process and kinetics are discussed. 
  Reference    (Z. Naturforsch. 31a, 408—413 [1976]; received March 5 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0408.pdf 
 Identifier    ZNA-1976-31a-0408 
 Volume    31 
74Author    Karl-Peter WanczekRequires cookie*
 Title    Mechanism and Structure in the Ion Chemistry of Tetramethyldiphosphine: An Ion Cyclotron Resonance Spectrometric Study  
 Abstract    The mass spectrum of tetramethyldiphosphine and the ion chemistries of this compound and of its mixtures with phosphine and dimethvlphosphine have been investigated by ion cyclotron reso-nance spectrometry. Numerous ion molecule reactions have been observed. The rate constants of the two most abundant ions formed by the molecular ion, the tetramethyldiphosphonium ion, H(CH3)2P-P(CH3)2 + and the hexamethyltriphosphonium ion, P3(CH3)6 + , are k2.35^0.1 X10 -10 cm 3 molecule -1 s _1 and /c2.40 = 1.5 X10 —10 cm 3 molecule -1 s — respectively. The structures of several ions have been determined with the aid of their ion-molecule reactions. The ions ra/e = 79 and 93 are thought to have the structures HP —P(CH3)H + and HP—P(CH3)2 + . The most probable structures of the ions m/e = 169 and 183 are HP(CH3)2-P(CH3)-P(CH3)2 + and (CH3)2P-P(CH3) — P(CH3)3 + . The protonated molecule undergoes several ion-molecule reactions, which proceed via an intermediate, m/e = 183, [(CH3)6P3 + ]* which is detected by double resonance ex-periments. 
  Reference    (Z. Naturforsch. 31a, 414—421 [1976]; received March 3 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0414.pdf 
 Identifier    ZNA-1976-31a-0414 
 Volume    31 
75Author    WilliamH. Hocking, Gisbert WinnewisserRequires cookie*
 Title    The Rotational Spectrum of Monothioformic Acid. I. eis-and /r*«5-HC(:0)SH 2  
 Abstract    The rotational spectra of the two abundant isomers of monothioformic acid, eis-and trans-HC(:0)SH, have been assigned in the frequency region 8 —250 GHz. Over 90 a-type transitions and over 60 6-type transitions have been measured for each rotamer. The a-type transitions belong to the <7Rk , ^Qi, IQ2 » and QQI branches and the 6-type absorption lines encompass the KA = 1 — 0, 2 — 1, 3 — 2, 4 — 3 and 5 — 4 rotational sub-bands. The rotational constants and all quartic and sextic centrifugal distortion constants have been determined for each rotamer using Watson's reduced Hamiltonian. In addition to the measured line positions the frequencies of some selected low-/ transitions, not observed in this work but of potential astrophysical interest, have been listed as an aid in the interstellar search for monothioformic acid. 
  Reference    (Z. Naturforsch. 31a, 422—337 [1976]; received March 11 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0422.pdf 
 Identifier    ZNA-1976-31a-0422 
 Volume    31 
76Author    WilliamH. Hocking, Gisbert WinnewisserRequires cookie*
 Title    The Rotational Spectrum of Monothioformic Acid. II. eis-and trans-HC(:0)SD, DC(:0)SH, HC(:0) 34 SH *> 2  
 Abstract    The rotational spectra of three isotopically substituted species of monothioformic acid, DCOSH, HCOSD, HC0 34 SH, have been investigated. Transitions arising from two different isomeric forms have been observed in each instance. Rotational constants and quartic centrifugal distortion con-stants have been determined for all species using Watson's reduced Hamiltonian. It has been estab-lished that the two abundant isomers of monothioformic acid are the planar eis and trans thiol rotamers. The structure of cis-HC (:0) SH is found to be: r(C-H) =1.100 A. r(S-H) =1.336 A, r(C-S) =1.771 Ä, r(C = 0) =1.210 Ä, <£(OCS) =122.4°, <£(HSC) =94.7° and <£(HCS) = 114.6°; whereas for mzrcs-HC (:0) SH: r(C-H) =1.100 A, r(S-H) =1.351 A, r(C-S) =1.763 A, r(C = 0) =1.218 A, <£(OCS) =126.0°, <£(HSC) =92.7° and <£(HCS) =111.8°. 
  Reference    (Z. Naturforsch. 31a, 438—453 [1976]; received March 11 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0438.pdf 
 Identifier    ZNA-1976-31a-0438 
 Volume    31 
77Author    0. Lutz, A. Nolle, P. KroneckRequires cookie*
 Title    Use of 95 Mo NMR Spectroscopy as a New Approach to Structural Analysis of Diamagnetic Molybdenum Complexes  
 Abstract    Fourier Transform NMR measurements of 95 Mo and 97 Mo are reported for several molybdenum compounds in different oxidation states. Using the molybdate ion as a reference, chemical shifts from about +500 ppm to about —1900 ppm have been observed. Experimental parameters and a chemical shift scale are given. 
  Reference    (Z. Naturforsch. 31a, 454—456 [1976]; received March 25 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0454.pdf 
 Identifier    ZNA-1976-31a-0454 
 Volume    31 
78Author    W. Dietz, H. Kilp, W. Noerpel, M. Straßmann, M. StockhausenRequires cookie*
 Title    Dielektrische Relaxation und Elektronenspinrelaxation von Eisen(III)acetylacetonat in verdünnter Lösung"  
 Abstract    The dielectric loss and electron spin resonance linewidth of ferric acetylacetonate have been measured in dilute solutions of benzene, m-and p-xylene, mesitylene and carbon tetrachloride. Per-mittivity measurements were made at 10 frequencies in the microwave region (1.2 m to 1 mm wave-length), ESR measurement at 2 frequencies (X and Q band). The permittivity results show a broad non-Debye pattern, yielding a mean correlation time of about 4 ps. The ESR results yield a mean correlation time of about 3 ps. The parallelism between the results obtained by both methods is discussed in view of a common relaxation process, which is the transient deformation of the chelate system resulting from stochastic induction by neighbouring solvent molecules. 
  Reference    (Z. Naturforsch. 31a, 457—462 [1976]; eingegangen am 6. März 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0457.pdf 
 Identifier    ZNA-1976-31a-0457 
 Volume    31 
79Author    K. Heinzinger, P. C. VogelRequires cookie*
 Title    A Molecular Dynamics Study of Aqueous Solutions III. A Comparison of Selected Alkali Halides  
 Abstract    Results of a molecular dynamics study of aqueous solutions of LiJ, LiCl, NaCl, CsCl and CsF are reported. The basic periodic box contained 200 water molecules, 8 cations and 8 anions, equiv-alent to 2.2 molal solutions. Static properties of the first hydration shells of the ions are discussed in detail on the basis of radial pair correlation functions, average potential energies of the water molecules and pair interaction energy distributions. The calculations lead to the conclusion that in the first hydration shells a lone pair orbital of the water molecule is directed towards the cation while a hydrogen atom points towards the anion. In the five alkali halide solutions investigated ion pairing occurs only with CsF. The hydration numbers, when defined as the volume integrals of the ion-water radial pair correlation functions up to the first minimum, increase with increasing ion size and depend on the size of the counterion. The water-water interactions in the solutions show not only features of pure water at elevated temperatures but also of pure water under compresion. The agreement between calculated and measured self diffusion coefficients is still insufficient. 
  Reference    (Z. Naturforsch. 31a, 463—475 [1976]; received January 30 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0463.pdf 
 Identifier    ZNA-1976-31a-0463 
 Volume    31 
80Author    P. C. Vogel, K. HeinzingerRequires cookie*
 Title    A Molecular Dynamics Study of Aqueous Solutions IV. Sodium Chloride at two Different Concentrations  
 Abstract    Results of a molecular dynamics study of a 0.55 molal aqueous NaCl solution are reported. The basic periodic box contained 200 water molecules, 2 sodium ions and 2 chloride ions. The calculated properties of this solution are compared with those obtained previously for a 2.2 molal NaCl solu-tion. The formation of second hydration shells, an increase of the number of water molecules in the first hydration shells, and a release of internal pressure are the main changes connected with a decrease of the concentration. 
  Reference    (Z. Naturforsch. 31a, 476—481 [1976]; received January 30 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0476.pdf 
 Identifier    ZNA-1976-31a-0476 
 Volume    31 
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