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1984[X]
61Author    U. Doberer, H. PortRequires cookie*
 Title     
 Abstract    rip le t S ta te s in I s o to p ic a lly M ix e d N a p h t h a le n e C r y s ta ls : H ig h R e s o lu tio n O p tic a l S p e c tr o s c o p y The triplet 0.0 transitions (T, « -► S0) of guest and host in various isotopically mixed naphtha­ lene crystals, with guest states below and above the host exciton band, are investigated applying both laser excitation spectroscopy and phosphorescence emission spectroscopy. Guest monomer and aggregate spectra are analyzed at helium temperatures (1.6-4.2 K) with regard to line positions, splittings, polarizations and intensities. Shift and broadening of the host Davydov components are studied as a function of the guest concentration (at 1.6 K). In particular, the analysis provides precise values for the individual isotopic shifts U0 and the exciton band structure parameters including the critical isotopic shift. Site splitting is spectrally resolved for several monomers and also for the AB-dimer of 1,4-Nd2 in Nd8. 
  Reference    Z. Naturforsch. 39a, 413—426 (1984); received February 20 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-0413 
 Volume    39 
62Author    L. Pasimeni, C. Corvaja, G. Agostini, G. GiacomettiRequires cookie*
 Title      
 Abstract    The intensity of the DF-ODMR spectrum has been derived when unlike triplets contribute to the annihilation process (heterofusion). Resonant microwave transitions that perturb the spin levels of the triplet pair and of the species diffusing separately (free species) were considered. In the latter case the DF-ODMR signals are negative at any orientation of the magnetic field. The spectra of single crystals of the Diphenylacetylene(DPA)-TCNB complex support the theoretical expectations. 
  Reference    Z. Naturforsch. 39a, 427—433 (1984); received December 27 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0427.pdf 
 Identifier    ZNA-1984-39a-0427 
 Volume    39 
63Author    T. Sumiyoshi, A. Henne, P. Lechtken, W. SchnabelRequires cookie*
 Title      
 Abstract    Upon UV-irradiation, various phosphine oxides of the general structure I were found to be fragmented readily into free radicals I' and I": 
  Reference    Z. Naturforsch. 39a, 434—436 (1984); received February 21 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0434.pdf 
 Identifier    ZNA-1984-39a-0434 
 Volume    39 
64Author    Hoppe, W. MatzRequires cookie*
 Title     
 Abstract    tr u c tu r e I n v e s tig a tio n in to A c e t o n it r i le S o l u ti o n s o f M g (C 1 0 4) 2 by N e u tr o n D if f r a c tio n U. The structure of acetonitrile solutions of Mg(C104)2 at two concentrations (c = 0.38 mole/1 and 0.74 mole/1) is studied by neutron diffraction. The results are interpreted by a simple structure model. A good description is achieved for c = 0.38 mole/1 by an octahedral surrounding of Mg2+ by acetonitrile molecules. For the higher concentration the fit results in a mixture of tetrahedral and octahedral surroundings. 
  Reference    Z. Naturforsch. 39a, 437—440 (1984); received January 23 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0437.pdf 
 Identifier    ZNA-1984-39a-0437 
 Volume    39 
65Author    H. StumpfRequires cookie*
 Title     
 Abstract    n d R e n o rm a liz a b le U n ifie d N o n lin e a r S p i n o r F ie ld M o d e ls The nonrenormalizable first order derivative nonlinear spinor field equation with scalar inter­ action possesses two equivalent Hamiltonians. The first is the conventional one while the second is a two-field Hamiltonian with the original field and its parity transform. By quantization the latter leads to an inequivalent representation compared with the former. This is connected with parity symmetry breaking and the loss of simultaneous diagonalization of energy and subfield particle numbers. The corresponding grand canonical Hamiltonian is shown to result equivalently from a renormalizable second order derivative nonlinear spinor field equation. This is achieved by means of a theorem about the decomposition of higher order derivative nonlinear spinor field equations derived previously. 
  Reference    Z. Naturforsch. 39a, 441—446 (1984); received December 24 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0441.pdf 
 Identifier    ZNA-1984-39a-0441 
 Volume    39 
66Author    F. Siegling, K. NiemaxRequires cookie*
 Title      
 Abstract    The wings of the Cs resonance line (62S1/2 — 62Pi/2)3/2) broadened by noble gases (He, Ne, Ar and Kr) at low pressures (p ^ 700 Torr) have been measured in absorption in the range 4 up to a few hundred wavenumbers from the line centres. The far wings are compared with quasistatic wings based on the semiempirical potentials by Baylis and by Pascale and Vandeplanque. In some cases the agreement between the experimental and theoretical line wings is found to be reasonable. L o w -p re ssu re N o b le G a s B r o a d e n in g o f th e C s R e s o n a n c e L in e s 
  Reference    Z. Naturforsch. 39a, 447—454 (1984); received October 1 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0447.pdf 
 Identifier    ZNA-1984-39a-0447 
 Volume    39 
67Author    F. Siegling, K. NiemaxRequires cookie*
 Title      
 Abstract    The noble gas broadening (Ar and Kr) of the Cs resonance lines 8944 and 8521 Ä (62S i/2_62P|/2,3/2) was measured in absorption up to perturber pressures of about 20 atm. The experimental shapes of the 8944 A line induced by multiperturber interaction are compared with theoretical shapes calculated by means of the quasistatic theory assuming additivity of the A2n U2-X 2I U2 difference potential energies. H ig h -P re s s u re N o b le G a s B r o a d e n in g o f th e C s R e s o n a n c e L in e s 
  Reference    Z. Naturforsch. 39a, 455—463 (1984); received November 30 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0455.pdf 
 Identifier    ZNA-1984-39a-0455 
 Volume    39 
68Author    Radnai, E. KálmánRequires cookie*
 Title     
 Abstract    The structure of a concentrated solution of MgCl2 in methanol has been studied by X-ray diffraction. The parameters for the ion-solvent interactions are in good agreement with those found in aqueous solutions. Both for Mg2+ and Cl_ the solvate shells are composed of 6 methanol molecules. An average octahedral arrangement of OH groups in the solvate shells of magnesium is probable. Octahedral symmetrical positions for CH3 groups proved to be unlikely. X -R a y D if fr a c tio n S tu d y o f M g C l 2 in M e th a n o l 
  Reference    Z. Naturforsch. 39a, 464—470 (1984); received September 15 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0464.pdf 
 Identifier    ZNA-1984-39a-0464 
 Volume    39 
69Author    KjemmRequires cookie*
 Title     
 Abstract    A change with concentration in the height of the first peak of the pair distribution function g+_ of a salt in a mixture of molten salts indicates a change in the degree of association of that salt. It is shown that the changes in association observed this way from MD-simulations of binary mixtures of charge symmetric salts with a common anion are qualitatively consistent (i) with the requirements for the occurrence of the crossing of mobility isotherms (Chemla effect) and (ii) with the ideal law of mass action. 
  Reference    Z. Naturforsch. 39a, 471—474 (1984); received February 15 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0471.pdf 
 Identifier    ZNA-1984-39a-0471 
 Volume    39 
70Author    F. Porsch, H. Stegemeyer, K. HiltropRequires cookie*
 Title     
 Abstract    le c tric F ie ld -In d u c e d B ire frin g e n c e in L iq u id -C ry s ta llin e B lu e P h a s e s Herrn Prof. Dr. E. Kuss zum 70. Geburtstag gewidmet The optical behaviour of liquid-crystalline 'Blue Phases' (BP) of polar cholesterogenic compounds in electric Fields up to 100 kV • cm-1 has been investigated by means of polarization microscopy. By an observation parallel to the field direction a birefringence dependent on the Field strength was detected in the BP I. This result is discussed in terms of a non-linear electro-optic effect, showing that the BP I becomes optically biaxial in an electric field. In the BP II a birefringence was not observed under the same conditions probably indicating that the field induces an optical uniaxiality with the optic axis parallel to the field. The results are discussed with respect to possible cubic structures of the BPs. 
  Reference    Z. Naturforsch. 39a, 475—480 (1984); received February 28 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0475.pdf 
 Identifier    ZNA-1984-39a-0475 
 Volume    39 
71Author    Häupl, P. WißmannRequires cookie*
 Title     
 Abstract    u a n tita tiv e A n a ly s is o f th e I n te n s ity o f I n te r f e r e n c e F r in g e s o f X -R ay D iffra c tio n L in e P r o f ile s K. X-Ray diffraction spectra of thin films may show characteristic interference fringe patterns which wash out with increasing surface roughness. From the intensity of the secondary maxima quantitative data on the roughness can be derived. Model calculations are presented assuming that the distribution of heights about the mean surface level is Gaussian. The theory is applied to explain the diffraction spectra of single-crystal silver films. It is shown that some uncertainty in the results remains due to the influence of lattice distortions. 
  Reference    Z. Naturforsch. 39a, 481—485 (1984); received February 4 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0481.pdf 
 Identifier    ZNA-1984-39a-0481 
 Volume    39 
72Author    Gerhard Raabe, Jörg Fleischhauer, Lehr-Und Forschungsgebiet, Theoretische ChemieRequires cookie*
 Title     
 Abstract    e m ie m p irisc h e R e c h n u n g e n z u r P r o t o n e n a f f i n i t ä t u n v e rz w eig te r a lip h a tis c h e r A m in e Semiempirical Calculations on the Proton Affinity of Unbranched Primary Aliphatic Amines The experimental gasphase proton affinities of some alkylamines are found to correlate with the Mulliken charges on the NHr groups of the corresponding ammonium-cations as calculated by the semiempirical MINDO/3-and MNDO-method rather than with the electron density at the nitrogen-atom or the NH2-group of the corresponding Amines. As can be seen from the charges of the NH2-groups of the amines, the alkyl-chains do not exhibit a general positive inductive effect. It is found that the amount of electron density transferred to an attacking proton increases with the length of the alkyl-chains. This effect is similar to the so-called inductomeric effect introduced by Ingold. 
  Reference    Z. Naturforsch. 39a, 486—489 (1984); received February 4 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-0486 
 Volume    39 
73Author    Z. NaturforschRequires cookie*
 Title     
 Abstract    h o to lu m in e s z e n z u n d E n e r g ie tr a n s f e r in S e lte n e rd -a k tiv ie r te n G r a n a t G d 3 T e 2L i3O i2 B. Köngeter und S. Kemmler-Sack Photolwninescence and Energy Transfer in the Rare Earth Activated Garnet GdjTeiLi^O l2 By activation of the cubic garnet host lattice Gd3Te2Li30 ,2 with trivalent rare earth ions the most intense visible emission is observed for Ln3+ = Eu, Tb. Energy transfer from Gd3+ to Sm3+, Eu3+ or Dy3+, from Tb3+ to Eu3+ and from Er3+ to Tm3+ has been found to occur. The lumines­ cence properties are strongly influenced by the substitution of Te6+ by W6"1 " (systems Gd3_vLnvTe2_l.WlLi30 12). 
  Reference    Z. Naturforsch. 39a, 490—494 (1984); eingegangen am 13. Februar 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0490.pdf 
 Identifier    ZNA-1984-39a-0490 
 Volume    39 
74Author    V. Renugopalakrishnan, R. WalterRequires cookie*
 Title      
 Abstract    * Diese Arbeit ist Prof. Roderich Walter zum Andenken gewidmet (i 19. Sept. 1979). An ab initio molecular orbital technique was used to investigate the rotational barrier about the disulphide bridge in dimethyl disulphide. Various minimal and extended basis sets were used in the calculations. The chosen minimal basis set was the STO-3G set, and the extended basis sets were the ST0 4-31G set, the Dunning and Hay set consisting of contracted Gaussian basis sets: [2s], [3s, 2p] and [6s, 4p] for H, C, and S atoms, and the Dunning and Hay basis set augmented with a d-type function on S atoms. The total energy was calculated as a function of the torsion angle about the disulphide bond. The barrier to rotation about this bond was found to be two-fold in nature, in accordance with previous findings. The heights of the barriers were observed to depend upon the basis set and input geometry. For our particular choice of basis sets and input geometry, the calculated value of the eis and trans barriers ranged from 12.68 to 16.49 kcal/mol and from 6.23 to 8 kcal/mol, respectively. Inclusion of a d-type function in the basis sets was found to result in better agreement between the calculated and experimental values, thereby emphasizing the need for considering 3d orbitals of sulphur in MO calculations. 
  Reference    Z. Naturforsch. 39a, 495—498 (1984); received January 17 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-0495 
 Volume    39 
75Author    C. M. Wai, M. BlanderRequires cookie*
 Title      
 Abstract    The solubilities of Al^O-, in LiCl-KCl eutectic mixtures containing dissolved A1C13 were measured using a sensitive proton activation technique. The results are consistent with the presence of an A10+ species at 4.7 x 10-5 mole fraction with A1C13 at 10_2mole fraction. When combined with other thermodynamic data, these solubilities are used to deduce a formation constant for the A10+ species from Al3+ and O2-ions of 1.94 x 1022 (in mole fraction units) and a specific bond free energy ("bond strength") of 300 kJ 
  Reference    Z. Naturforsch. 39a, 499—502 (1984); received March 10 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-0499 
 Volume    39 
76Author    C. G. KoutroulosRequires cookie*
 Title     
 Abstract    S im p lified F o rm o f th e H e r m i t ia n iz i n g M a t r i x fo r th e H a l f I n te g e r S p in B h a b h a F ie ld s The hermitianizing matrix of the Bhabha fields for 5 = half integer can be simplified to the form f(x, s) = (— 1 y~p~U2 and as a result the charge of these fields for s > 1/2 is indefinite. 
  Reference    Z. Naturforsch. 39a, 503—506 (1984); received January 4 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-0503 
 Volume    39 
77Author    M. ZanderRequires cookie*
 Title    Mikrokristallbildung und intermolekulare Triplett-Triplett-Energieübertragung in festen transparenten Gläsern bei 77 K. Das System N-M ethylcarbazol/Naphthalin  
 Abstract    Microcrystal Formation and Intermolecular Triplet-Triplet Energy Transfer in Rigid Transparent Glasses at 77 K. The System N-Methyl-earbazole / Naphthalene The efficient intermolecular triplet-triplet energy transfer between N-methylcarbazole (donor) and naphthalene (acceptor) observed at 10~2m concentration of donor and acceptor in a rigid transparent methylcyclohexane/w-pentane glass at 77 K is shown to occur in microcrystals of the donor containing small amounts of the acceptor. 
  Reference    Z. Naturforsch. 39a, 507—508 (1984); eingegangen 7. März 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-0507_n 
 Volume    39 
78Author    A. KawskiRequires cookie*
 Title    The Relaxation Time of the Orientation Polarization and its Influence on the Luminescence Intensity Distribution  
 Abstract    The characteristic relaxation time rR of the orientation polarization of polar solvent molecules around polar luminescent molecules influences the spectral emission distribution depending on rf > tr or tf ^ tr . This is shown on the luminescence of the polar molecules 4-iso-cyanate-4'-dimethylamino-transstilbene (CDS), 4-isocya-nate-4'-methoxy-trans-stilbene (CMS) and 4-isocyanate-3',4'-dimethoxy-trans-stilbene (CDMS) (having a very short lifetime tf < 10 ps) in chlorobenzene. 
  Reference    Z. Naturforsch. 39a, 509—510 (1984); received December 21 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0509_n.pdf 
 Identifier    ZNA-1984-39a-0509_n 
 Volume    39 
79Author    W. Kasten, W. Stahl, H. DreizlerRequires cookie*
 Title      
 Abstract    We present the test measurements with a Stark cell for Microwave Fourier Transform Spectroscopy, which is precise enough to improve the measurement of dipole moments. Stark Effect Measured by Microwave Fourier Transform Spectroscopy 
  Reference    Z. Naturforsch. 39a, 511—512 (1984); received February 29 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0511_n.pdf 
 Identifier    ZNA-1984-39a-0511_n 
 Volume    39 
80Author    J. Czuchaj, SienkiewiczRequires cookie*
 Title     
 Abstract    The thallium-heavy noble gas potentials and absorption oscillator strengths as a function of internuclear separation have been recalculated using a somewhat modified Baylis' model for the electronic interaction between the atoms. The calculated potentials associated with the 62PI/2, 6:PV2 and 72Sl/2 thallium states are compared to the potentials determined by Cheron et al. from the measurement of continuum emission intensities on the extreme wings of the TI resonance lines due to noble gas perturbers. The shift and broadening coefficients for the 3776 and 5350ä lines of thallium perturbed by noble gases have also been estimated from the present potentials. The agreement with the experiment is quite good. Moreover, the very strong emis­ sion TIXe band centered at approximately 6000, 4300 and 3650 a, as observed experimentally, can be predicted by the calculated potentials as well. Im proved P s e u d o p o te n tia l C a lc u la tio n s o f th e A d ia b a tic P o te n tia ls a n d O s c illa to r S tr e n g th s o f T l-H e a v y N o b le G a s S y s te m s * 
  Reference    Z. Naturforsch. 39a, 513—523 (1984); received November 29 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0513.pdf 
 Identifier    ZNA-1984-39a-0513 
 Volume    39 
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