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Facet   Publication Year 1988  [X]
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1988[X]
61Author    Pinaki Roy, Rajkumar RoychoudhuryRequires cookie*
 Title     
 Abstract    x a c t A n a ly tic a l S o lu tio n s o f th e N o n P o ly n o m ia l O s c illa to r V (x) = Jt2 + (1 + g x >) We derive new exact (analytical) solutions of the non polynomial oscillator F(x) = x2 + zx2/ (1 + g x2) in one as well in three dimensions. The solutions are derived within the framework of supersymmetric quantum mechanics, and it is shown that exact solutions exist when the coupling constants satisfy a supersymmetric constraint. 
  Reference    Z. Naturforsch. 43a, 360—362 (1988); received July 16 1987 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0360.pdf 
 Identifier    ZNA-1988-43a-0360 
 Volume    43 
62Author    Z. Tempczyk, Gryczyński, A. Kawski, Z. GrzonkaRequires cookie*
 Title     
 Abstract    Experimental and theoretical directions of electronic transition moments and the UV spectra of anionic and neutral 5-phenyltetrazole (5-PhTH) have been determined. Based on the correlation between the theoretical and experimental data it has been found that the 2 H-tautomeric form is predominant in polyvinyl alcohol (PVA) film. S p e c tro s c o p ic A n a ly s is o f T a u to m e ric F o r m s o f 5 -P h e n y lte tr a z o le * 
  Reference    Z. Naturforsch. 43a, 363—368 (1988); received January 28 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0363.pdf 
 Identifier    ZNA-1988-43a-0363 
 Volume    43 
63Author    F. WinterbergRequires cookie*
 Title      
 Abstract    A vector theory of gravity with substratum is proposed, which reproduces all the empirically verified linear and nonlinear predictions of Einstein's gravitational field equations, but unlike Einstein's theory, it does not lead to the unphysical singularities and causality-violating solutions permitting travel back in time. In the proposed alternative theory, a substratum or ether is the cause of all relativistic effects, and for this reason is assumed to obey a nonrelativistic equation of motion, an assumption which allows the substratum to consist of densely packed positive and negative Planck mass particles. A substratum of this kind can produce the vacuum fluctuations, needed to be in agreement with the empirical evidence, but avoids the paradox of infinite gravitationl forces, predicted by a divergent zero point energy, the only one possible under the strict adherence to the kinematic interpretation of special relativity. 
  Reference    Z. Naturforsch. 43a, 369—384 (1988); received January 21 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0369.pdf 
 Identifier    ZNA-1988-43a-0369 
 Volume    43 
64Author    Ch Keussen, U. Andresen, H. DreizlerRequires cookie*
 Title    4N  
 Abstract    Q u a d r u p o le C o u p lin g in th e R o ta tio n a l S p e c tru m o f N itro s o b e n z e n e As the technique of microwave Fourier transform (MWFT) spectroscopy was improved in the recent years we give a reinvestigation of the 14N nuclear quadrupole hyperfine structure of nitroso­ benzene. 
  Reference    Z. Naturforsch. 43a, 385—387 (1988); received February 6 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0385.pdf 
 Identifier    ZNA-1988-43a-0385 
 Volume    43 
65Author    A. Petcov, A. Kirfel, K. Fischer, Fr KristallographieRequires cookie*
 Title     
 Abstract    e n s o ria l R e p r e s e n ta tio n o f / ' f o r N b in L ith iu m -n io b a te , L i N b 0 3 Using Synchrotron radiation, the dependence of resonant phenomena (absorption, fluorescence and Raman scattering) on the angle between the polarisation plane of the incident radiation and the polar c-axis in ferroelectric Lithium-niobate, LiNb03, was studied in the vicinity of the Nb K-absorption edge. Applying the "optical theorem", the observed dipolar anisotropics can be explained in terms of the projection of the dipole momentum operator on the polarisation vector of the X-ray photons. 
  Reference    Z. Naturforsch. 43a, 388—390 (1988); received January 22 1988 
  Published    1988 
  Keywords    Synchrotron radiation, X-ray absorption, Anomalous dispersion, Ferroelectricity, LiNb03 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0388.pdf 
 Identifier    ZNA-1988-43a-0388 
 Volume    43 
66Author    ArminH. Kirfel, KarlF. FischerRequires cookie*
 Title    Anisotropic Anomalous Dispersion in Cuprite, Cu20 Klaus Eichhorn Hamburger Synchrotron-Strahlungs-Labor HASYLAB  
 Abstract    The paper reports the observation of significant "reso­ nance peaks" in the intensity vs. energy curves around the Cu-K-absorption edge for forbidden reflections in centro-symmetric cubic Cu20. A qualitative interpretation is given in terms of an anisotropic anomalous dispersion model based on /', /"-tensors compatible with the symmetry at the Cu-site. 
  Reference    Z. Naturforsch. 43a, 391—392 (1988); received December 23 1987 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0391_n.pdf 
 Identifier    ZNA-1988-43a-0391_n 
 Volume    43 
67Author    Maximilian ZanderRequires cookie*
 Title    On the Relationship Between the Rates of the Radiative and Radiationless Deactivation of the Lowest Triplet State of Aromatic Compounds  
 Abstract    For groups of structurally related aromatic compounds with similar Tj-S0 energy gap linear correlations exist be­ tween the rate constants of the radiative and radiationless T(S0 transition. Significant exceptions may indicate fur­ ther radiationless deactivation processes originating in Tj in addition to Tj -> S0 intersystem crossing. 
  Reference    Z. Naturforsch. 43a, 393—394 (1988); received March 3 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0393_n.pdf 
 Identifier    ZNA-1988-43a-0393_n 
 Volume    43 
68Author    Dieter Pfirsch, Frank PohlRequires cookie*
 Title     
 Abstract    lte rn a tiv e C o n s tr a in ts in th e E n tr o p y P r in c ip le f o r T o k a m a k P r o file s A p p lie d to C y lin d ric a l P la s m a s The recently proposed variational principle called the "entropy principle" is now applied with alternative constraints to cylindrical plasmas. These alternative constraints are that the pressure balance relation and Ohm's law with Spitzer conductivity and constant electric field should persist during the variations, replacing the constraint of fixed relations between the plasma pressure and density profiles used in the previous work. This leads to a one-parameter family of slightly paramag­ netic equilibria, the parameter being the internal plasma ß. The safety factor ratio is found to be about 2. The corresponding plasmas are close to isentropic and their profiles agree reasonably with Coppi's profile consistency formula for the temperature profiles. A modification of Coppi's formula greatly improves the agreement. 
  Reference    Z. Naturforsch. 43a, 395—401 (1988); received February 12 1988 
  Published    1988 
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 Identifier    ZNA-1988-43a-0395 
 Volume    43 
69Author    Thomas Giesen, M. Harter, R. Schieder, G. Winnewisser, K.M T YamadaRequires cookie*
 Title     
 Abstract    ig h R e s o lu tio n S p e c tro s c o p y U s in g a S ta b iliz e d D io d e L a s e r : th e 2 v9 B a n d o f H N 0 3 1 The high resolution spectrum of the 2 v9 band of HN03 has been recorded by a tunable diode laser spectrometer with a newly developed frequency stabilization technique. The spectral data were digitally stored and processed by a dedicated micro-computer in order to improve the sensitivity and the precision of the measurements. In addition to the anomalies due to the Fermi resonance with the v5 = 1 state, we have observed the line doubling caused by the internal rotation of the OH group. 
  Reference    Z. Naturforsch. 43a, 402—406 (1988); received February 4 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0402.pdf 
 Identifier    ZNA-1988-43a-0402 
 Volume    43 
70Author    P. Wallraff, G. Winnewisser, K.M T YamadaRequires cookie*
 Title      
 Abstract    The infrared spectrum of 1,1-Difluoroethylene has been measured in a supersonic free jet by diode-laser spectroscopy in the wavenumber region between 921 and 928 cm"\ The low rotational temperature, 32(8) K, of the molecules in the jet simplified the spectrum substantially, allowing its identification in the band center region. Two different modes of jet-operation were used for the measurements: (1) a pulsed jet with a phase sensitive detection at the pulse frequency and (2) a continuous jet with frequency modulation of the diode-laser. 
  Reference    Z. Naturforsch. 43a, 407—410 (1988); received February 23 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0407.pdf 
 Identifier    ZNA-1988-43a-0407 
 Volume    43 
71Author    B. BruhnRequires cookie*
 Title     
 Abstract    ie S e rie s a n d C a n o n ic a l T r a n s f o r m a tio n s in C o m p le x P h a s e S p a c e Dedicated to Prof. H. G. Schöpf on the Occasion of his 60th Birthday This paper considers the Lie series representation of the canonical transformations in a complex phase space. A condition is given which selects the canonical mappings from the Lie transformations associated with a complex-valued generating function. Some special types of mappings and some simple algebraic tools are discussed. 
  Reference    Z. Naturforsch. 43a, 411—418 (1988); received January 25 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0411.pdf 
 Identifier    ZNA-1988-43a-0411 
 Volume    43 
72Author    George MaroulisRequires cookie*
 Title     
 Abstract    le c tric a l P ro p e rtie s f o r H C O + a n d N N H + fro m F o u r th -O r d e r M 0 lIe r-P le sse t P e r tu r b a tio n T h e o ry Electric multipole moments and static polarizabilities are reported for HCO+ and NNH + . Both molecular ions are of great importance to interstellar matter chemistry. All properties were calculated from the energy of the molecule in the presence of distant electric charges. Electron correlation effects were taken into account via SDQ-MPPT(4), fourth-order Moller-Plesset Perturbation Theory with single, double and quadrupole substitutions from the reference SCF wavefunction. With the exception of the dipole moment, values for the other properties studied in this work appear in the literature for the first time. The dipole moment (relative to the centre of mass) and the axial and perpendicular components of the dipole polarizability are 1.515 ea0, 13.39 and 6.88 e2a\Eh "' respectively for HCO+ and 1.328 ea0, 13.81 and 5.70 e2a2 0Eh "' for NNH + . 
  Reference    Z. Naturforsch. 43a, 419—429 (1988); received February 5 1988 
  Published    1988 
  Keywords    HCO +, NNH +, Electric Moments, Electric Polarizabilities 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0419.pdf 
 Identifier    ZNA-1988-43a-0419 
 Volume    43 
73Author    Ryun Park, Nikola GetoffRequires cookie*
 Title    Hyoung  
 Abstract    The photoinduced conversion of CO in aqueous solution under the influence of vacuum-uv radiation at /. = 185nm has been investigated at pH values ranging from 2 to 13. Formaldehyde, glyoxal, carboxylic acids and small amounts of glycol were determined as final products. Initial quantum yields for product formation have been determined. A probable reaction mechanism is presented. P h o to in d u c e d T r a n s f o r m a tio n o f C a r b o n M o n o x id e in A q u e o u s S o lu tio n 
  Reference    Z. Naturforsch. 43a, 430—434 (1988); received February 16 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0430.pdf 
 Identifier    ZNA-1988-43a-0430 
 Volume    43 
74Author    AdelN. Asaad, Gunnar AksnesRequires cookie*
 Title    K in e tic s a n  
 Abstract    d M e c h a n is m o f th e 2 + 2 C y c lo a d d itio n o f T e tra c y a n o e th y le n e to 2 ,5 -D im e th y l-2 ,4 -H e x a d ie n e The kinetics of the 2 + 2 cycloaddition reaction between tetracyanoethylene and 2,5-dimethyl-2,4-hexadiene in different solvents has been studied by following the disappearance of the interme­ diate EDA-complex spectrophotometrically. It is concluded that the EDA-complex is transformed through a concerted cyclicpolar transition state to give the vinyl cyclobutane derivative (III). The effects of various solvents on the reaction rates have been analysed using a multiparameter approach. The thermodynamic parameters (AH0 and /IS0), of EDA-complex formation and the activation parameters (AH* and /IS*) of the cycloaddition have been discussed. 
  Reference    Z. Naturforsch. 43a, 435—441 (1988); received December 10 1987 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0435.pdf 
 Identifier    ZNA-1988-43a-0435 
 Volume    43 
75Author    Alfred Klemm, Y. Fujii, M. HosoeRequires cookie*
 Title      
 Abstract    E x c h a n g e E le c tr o m ig r a tio n a n d C h r o m a to g r a p h y fo r I s o to p e S e p a r a tio n The Height of an Equivalent Theoretical Plate (HETP) is a characteristic process constant for any separation column in which a small elementary effect is to be multiplied. The smaller the HETP. the steeper is the enrichment along the column. In order to determine the HETP experimentally, it is not necessary to bring the column into the final, stationary state. One can more readily evaluate it from the initial slope of the enrichment at a closed end of the column. This is demonstrated for isotope separations on lithium, copper, rubidium and uranium obtained recently by means of exchange electromigration and chromatography. 
  Reference    Z. Naturforsch. 43a, 442—448 (1988); received March 11 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0442.pdf 
 Identifier    ZNA-1988-43a-0442 
 Volume    43 
76Author    Masahisa KakiuchiRequires cookie*
 Title     
 Abstract    r a c tio n a tio n o f H y d r o g e n Is o to p e s in A q u e o u s L ith iu m C h lo rid e S o lu tio n s The D/H ratio of hydrogen gas in equilibrium with water vapor over aqueous lithium chloride solutions was measured at 25 °C, using a hydrophobic platinum catalyst. Experimental details are described. The hydrogen isotope effect between the solution and pure water depends linearly on the LiCl concentration up to ca. 12 m, and at higher concentrations a marked deviation from linearity takes place, as was also observed for the oxygen isotope effect measured by Bopp et al. On the basis of these hydrogen and oxygen isotope effects it is concluded that H2lsO is enriched in the water molecules coordinated to Li+ ions and HDieO is enriched in the free water molecules of the solution. The observed deviation from linearity for concentrations higher than ca. 12m is interpreted in terms of structural changes in the hydration sphere of the Li+ ions. Key words: Fractionation of hydrogen isotopes, Aqueous lithium chloride solution. Hydrophobic platinum catalyst, Dependence of D/H fractionation on molality, Comparison of hydrogen and oxygen isotope effects. 
  Reference    Z. Naturforsch. 43a, 449—453 (1988); received May 21 1987 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0449.pdf 
 Identifier    ZNA-1988-43a-0449 
 Volume    43 
77Author    S. C. Mehrotra, H. MäderRequires cookie*
 Title     
 Abstract    tu d y o f T x-a n d r 2-R e la x a tio n by M ic ro w a v e P u ls e T e c h n iq u e s: R o ta tio n a l T r a n s itio n J = 0 -1 o f H C C F , /-D e p e n d e n c e o f R o ta tio n a l T r a n s itio n s o f S 0 2 , a n d /-T y p e D o u b le t T ra n s itio n s o f H C 1SN P e r tu r b e d by S e lf, H 2 , D 2 , a n d H e With a K-band bridge type superhet spectrometer, the pressure dependence of the population decay rate 1/Ti by using a (n, r, n/2) pulse technique, and of the coherence decay rate 1 /T2 by using a 7t/2-pulse technique, have been determined for the following systems at room temperature: (a) rotational transition J = 0—1 of fluoroacetylene (HCCF), (b) seven rotational transitions of sulfur dioxide (S02) with 5^ J^37, both (a) and (b) with pure gases, and (c) /-type doublet transitions of hydrogen cyanide (HC15N) in the (01*0) vibrational state with J = 9 and 10 using HC15N, H2, D2 and He as perturbers. A theoretical treatment of Bloch-type equations with a special attention to the M-degeneracy of the energy levels is also considered to describe the microwave pulse experiments. For systems (b) and (c), the values of l/7\ are found to be significantly smaller than corresponding values of 1/T2, indicating adiabatic collisions as a dominant mechanism for the decay of sample coherence. For the system (a), the value of l/7\ is found to be slightly greater than the corresponding value of 1/T2. The normalized perturbative collision theory proposed earlier has been applied to explain the results of systems (a) and (c). The unsatisfactory agreement between theory and experi­ ment for the system (c) indicates that a nonperturbative approach or a higher order perturbation treatment should be taken into consideration for a better description of collision dynamics. 
  Reference    Z. Naturforsch. 43a, 454—468 (1988); received February 23 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0454.pdf 
 Identifier    ZNA-1988-43a-0454 
 Volume    43 
78Author    U. Keussen, H. Andresen, DreizlerRequires cookie*
 Title    Ch  
 Abstract    We investigated the 14N quadrupole coupling of three rotational isomers of ethyl nitrite in the ground state by microwave Fourier transform spectroscopy. Centrifugal distortion analyses were necessary to assign the transitions with high J quantum numbers. We found an additional splitting of some c-type transitions of the trans-gauche rotamer presumably arising from tunneling through the barrier separating the two equivalent gauche forms. This assumption could not be confirmed yet. 14N Q u a d ru p o le C o u p lin g in th e R o ta tio n a l S p e c tr u m o f E th y l N itrite 
  Reference    Z. Naturforsch. 43a, 469—475 (1988); received February 29 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0469.pdf 
 Identifier    ZNA-1988-43a-0469 
 Volume    43 
79Author    E. Dachwitz, M. StockhausenRequires cookie*
 Title    in  
 Abstract    th e D ie le c tr ic R e la x a tio n B e h a v io u r o f P u r e L iq u id s In order to find out whether liquids consisting of pure enantiomers of a chiral molecule differ in their dielectric relaxation behaviour from that of corresponding racemic mixtures, the complex permittivity of the following pure substances was measured over a broad frequency range (3 MHz to 72 GHz) at 20 C C: Phenylethylisocyanate, carvone, fenchone, 2-octanol, 2-amino-l-butanol, diethyltartrate and diisopropyltartrate. With the achieved experimental resolution, no stereoisome­ rs effect could be observed with the exception of the tartrates, where there are clear differences in the low frequency features of the enantiomers as compared to the racemic mixture, which very probably are an association effect. Key words: Association, dielectric relaxation, liquids, stereoisomers. O n th e O c c u r a n c e o f S te re o is o m e ric E ffe c ts 
  Reference    Z. Naturforsch. 43a, 476—480 (1988); received March 14 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0476.pdf 
 Identifier    ZNA-1988-43a-0476 
 Volume    43 
80Author    Helmut Gottwald, KonradG. WeilRequires cookie*
 Title     
 Abstract    r o p e rtie s o f C o ld C o n d e n s e d M e ta l C h lo rid e a n d o f C o c o n d e n se d M e t a l / M e t a l C h lo rid e F ilm s I I . R a m a n S p e c tr a We report on Raman spectroscopic investigations with cold condensed films of silver chloride, thallium chloride, and sodium chloride in the absence and in the presence of cocondensed metal. With films of 1000 nm —2000 nm thickness, Raman signals only can be seen if small silver particles are present. These are either cocondensed particles or they are formed by photolysis of silver chloride. At low temperatures, noncrystalline films can absorb light from the exciting laser, while at room temperature also crystalline silver chloride can be photolyzed by the argon ion laser. The signals are interpreted as surface enhanced Raman transitions of a chloride -silver vibration. No indications for the presence of silver chloride or thallium chloride molecules can be found from the spectra. 
  Reference    Z. Naturforsch. 43a, 481—484 (1988); received January 28 1988 
  Published    1988 
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 TEI-XML for    default:Reihe_A/43/ZNA-1988-43a-0481.pdf 
 Identifier    ZNA-1988-43a-0481 
 Volume    43 
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