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1998[X]
101Author    A. Kawski, G. Piszczek, I. Gryczyński, Z. GryczyńskiRequires cookie*
 Title    Fluorescence Anisotropy Decays of 4-Cyano-NJV-dimethylaniline in Propylene Glycol Studied by Frequency-Domain Fluorometry  
 Abstract    Dedicated to Professor J. R. Lakowicz on the occasion of his 50th birthday. The fluorescence lifetimes of 4-cyano-N,N-dimethylaniline (CDMA), measured in propylene glycol at 293 K using frequency-domain fluorometry, in the short emission (SE) and long emission (LE) bands are 20 ps and 1.65 ns, respectively. The higher emission anisotropies in the SE band compared to that in the LE band are due to weaker rotational depolarization of fluorescence. Emission anisotropy decays imply that the initial limiting emission anisotropy, r (0), is the same in the SE and LE bands and amounts to 0.28. This reflects the fact that the directions of transition moments in these bands are parallel. In the case of CDMA in propylene and ethylene glycol at temperatures from 293 to 343 K, viscosity more strongly affects the relaxation to the TICT state than does the change in polarity of the solvents used. 
  Reference    Z. Naturforsch. 53a, 711—716 (1998); received May 13 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0711 
 Volume    53 
102Author    Hideta Ishihara, Keizo Horiuchi, Shi-Qi Dou, ThorstenM. Gesing, J.-Christian Buhl, Helmut Paulus, Hartmut FuessRequires cookie*
 Title    Isolated versus Condensed Anion Structure IV: An NQR Study and X-ray Structure Analysis of [H 3 N(CH 2 )3NH 3 ]Cdl4 * 2H 2 0, [H 3 CNH 2 (CH 2 )3NH 3 ]CdBr4, [(CH 3 ) 4 N] 2 CdBr 4 , and [(CH 3 ) 3 S] 2 CdBr 4  
 Abstract    The phase I of [H 3 N(CH 2) 3 NH 3 ]CdI 4 • 2H 2 0 (1) crystallizes with isolated [Cdl 4 ] 2-tetrahedra; mono-clinic, C2/c, Z = 8, a = 1702.6(3), b= 1459.3(3), c= 1555.5(3) pm, and ß= 120.32(3)° at 299 K. (1) shows a first-order phase transition at T^n = 245 K. The eight I(vi) NQR lines in phase II change discontinuously into four lines in phase I. The transition entropy from DSC measurements, AS = 5.0 J mol -1 , shows that this transition is probably due to order-disorder of cations. [H 3 CNH 2 (CH 2) 3 NH 3 ]CdBr 4 (2) crystallizes with isolated [CdBr 4 ] 2 ~ tetrahedra, orthorhombic P2,2,2 1 , Z = 4,a= 1447.8(5), b = 1280.3 (4), c = 709.7(3) pm at 299 K. (2) shows four 8l Br NQR lines between 77 and around 325 K, above which temperature the lines disappear. [(CH 3) 4 N] 2 CdBr 4 (3) shows a sec-ond-order phase transition at T^n = 271 K. Three of four 81 Br NQR lines in phase II disappear below this transition point, the other line can be observed up to 315 K. The transition entropy, AS = 9.01 J KT 1 mol , indicates that the transition is an order-disorder type of the cations. [(CH 3)?S] 2 CdBr 4 (4) shows a first-order type phase transition at T^n = 304 K. The four lines spectrum of 8l Br NQR is observed in phase II and disappears above the transition point. The transition entropy, AS = 46.8 J KT 1 mol -1 is abnormally large. The role of the hydrogen bond and the bridging power between the halogen and cadmium atoms upon the formation of the condensed anion structure is dis-cussed. 
  Reference    Z. Naturforsch. 53a, 717—724 (1998); received March 11 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0717 
 Volume    53 
103Author    I. Pak, D. A. Roth, M. Hepp, G. Winnewisser, D. Scouteris, B. J. Howard, K.M T YamadaRequires cookie*
 Title    High resolution spectroscopy of Ar-CH 4 and Kr-CH in the 7 (i region (j = 1 <— 0 transition)  
 Abstract    Diode laser spectra of the rare gas -spherical top van der Waals complexes Ar-CH4 and Kr-CH4 were measured in the wavelength region near 1310 cm -1 and assigned. The most prominent lines of both complexes exhibit three dense but well resolved fl Po, °Ro, and R Qo branches, correlated to the R(0) transition of the triply degenerate bending vibration v\ of methane, CH4. A model Hamiltonian based on Coriolis coupled states was applied for the assignment, analysis and fitting of the spectra to within the experimental accuracy of « 15 MHz. The rotational B constants of the upper and lower states determined from the three allowed branches appeared to be strongly correlated. The precision in the determination of the rotational B constants of the two complexes was substantially increased by additional recording of several weak transitions in the nearly forbidden Q Po and r RQ branches, which were fitted together with the allowed transitions. The separation between the rare gas atom and the methane molecule in the ground vibrational state was determined to be 3.999 A and 4.094 A for Ar-CH4 and Kr-CH«, respectively. The measured small values of the splitting between the K=0 and the K = ±1 levels in the vibrationally excited state (0.39 cm -1 and 0.67 cm -1 for Ar-CH4 and Kr-CH4, respectively), which characterizes the anisotropy of the intermolecular potential, indicated that Kr-CH» and Ar-CH4 together with Ne-SiH4 represent examples close to the free rotor limit, where the spherical top CH4 is almost free to rotate within the complex. In comparison, the previously analyzed Ar-SiH4 van der Waals molecule is closer to the hindered rotor limit. 
  Reference    Z. Naturforsch. 53a, 725—732 (1998); received May 25 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0725 
 Volume    53 
104Author    E. Klisch, H. Klein, G. Winnewisser, E. HerbstRequires cookie*
 Title    Laboratory Rotational Spectrum of PH (N = 2 1) in the 1 THz Region  
 Abstract    The N = 2 <— 1 rotational transition of the PH radical in its ground electronic (X 3 X~) and vibrational states has been measured with the Cologne terahertz spectrometer in the frequency region between 920 and 1070 GHz. The PH radical was generated by immersing red phosphorus in a dc glow discharge of molecular hydrogen buffered with argon. Transition frequencies of the five J' — J" fine structure components together with the associated hyperfine structure patterns were precisely measured and analyzed to derive highly accurate molecular parameters, which are more extensive than those reported in the existing literature. Among the determined parameters are the rotational constant Bo = 252200.8099(63) MHz and the centrifugal distortion constant D 0 = 13.2915(33) MHz, as well as two fine structure constants -the spin-rotation constant 70 and the spin-spin interaction constant Ao -together with their centrifugal distortion contributions D 10 and D\ 0 . Furthermore, each of the magnetic hyperfine parameters 6 F , c, and the nuclear spin-rotation constants C x were obtained for both nuclei. The accuracy of previously obtained molecular constants has been improved by up to one order of magnitude. This new set of molecular parameters allows highly reliable frequency predictions of the rotational spectrum extending into the far infrared region; such transition frequencies may be of interest for interstellar spectroscopy. 
  Reference    Z. Naturforsch. 53a, 733—742 (1998); received July 8 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0733 
 Volume    53 
105Author    H. Dreizler, S. KassiRequires cookie*
 Title    On the Ambiguity of Complex Structures Derived from one Set of Rotational Constants  
 Abstract    It is shown algebraically that from one set of rotational constants or moments of inertia of a complex formed by an asymmetric top molecule and a rare gas atom, eight generally different structures result which are compatible with the moments of inertia. 
  Reference    Z. Naturforsch. 53a, 743—746 (1998); received June 22 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0743 
 Volume    53 
106Author    A.-A TurkyRequires cookie*
 Title    Analysis of Dispersion and Damping of Ion Waves in Plasma  
 Abstract    Experimental results are presented on the dispersion and damping of ion waves having a frequency range extending up to the ion plasma frequency. It was found that the Landau damping rate increases exponentially when the frequency of the ion wave approaches the ion plasma frequency ; while its phase velocity decreases slightly. The experimental results agree reasonably with previous theoretical predic-tions. The study indicates significant changes in Landau damping even with small variations in the wave velocity. 
  Reference    Z. Naturforsch. 53a, 747—750 (1998); received April 6 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0747 
 Volume    53 
107Author    F. WinterbergRequires cookie*
 Title    Resolution of the Ehrenfest Paradox in the Dynamic Interpretation of Lorentz Invariance  
 Abstract    In the dynamic Lorentz-Poincare interpretation of Lorentz invariance, clocks in absolute motion through a preferred reference system (resp. aether) suffer a true contraction and clocks, as a result of this contraction, go slower by the same amount. With the one-way velocity of light unobservable, there is no way this older pre-Einstein interpretation of special relativity can be tested, except in cases involv-ing rotational motion, where in the Lorentz-Poincare interpretation the interaction symmetry with the aether is broken. In this communication it is shown that Ehrenfest's paradox, the Lorentz contraction of a rotating disk, has a simple resolution in the dynamic Lorentz-Poincare interpretation of Lorentz invariance and can perhaps be tested against the prediction of special relativity. 
  Reference    Z. Naturforsch. 53a, 751—754 (1998); received July 14 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0751 
 Volume    53 
108Author    Christian Kollmar, SighartF. Fischer, MichaelC. BöhmRequires cookie*
 Title    MO-Theoretical Studies on a Model Complex for Deoxymyoglobin  
 Abstract    The origin of the displacement of the Fe atom in deoxymyoglobin with respect to the porphyrin plane in the high-spin state is examined by a qualitative molecular orbital (MO) analysis on the extended Hückel level. We find that attachment of a fifth ligand (imidazole in our model complex) to Fe(II)porphyrin favors the out-of-plane shift due to a strengthening of the bonding interaction between Fe and the nitrogen of the imidazole ligand. This results in a high-spin (5 = 2) ground state with Fe shifted out-of-plane for the five-coordinate complex instead of an intermediate spin ground state (5=1) with Fe lying in the plane for four-coordinate Fe(II)porphyrin. The relative energies of the different spin states as a function of the distance between Fe and the porphyrin plane are evaluated using an ROHF (restricted open shell Hartree-Fock) version of an INDO (intermediate neglect of differential overlap) method. We observe a level crossing between high-spin and intermediate spin states whereas the low-spin (5 = 0) state remains always higher in energy. 
  Reference    Z. Naturforsch. 53a, 755—765 (1998); received July 1 1998 
  Published    1998 
  Keywords    Metalloporphyrines, Electronic Structure, Structural Preferences, Molecular Orbital Model 
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 Identifier    ZNA-1998-53a-0755 
 Volume    53 
109Author    P. Lamparter, Ma Nuding, S. Steeb, R. BellissentRequires cookie*
 Title    Direct Measurement of the Hydrogen-Hydrogen Correlations in Hydrogenated Amorphous Ni 56 Dy 44 by Neutron Diffraction  
 Abstract    From an isotopic mixture of dysprosium with zero neutron scattering length and an isotopic mixture of nickel with zero neutron scattering length ribbons of the amorphous alloy Ni 56 Dy 44 were produced by melt-spinning and loaded with 59 at% deuterium. A neutron diffraction experiment yielded directly the deuterium-deuterium partial structure factor S DD and the partial pair correlation function G DD . The incorporation of the D-atoms into the amorphous matrix shows an ordering up to five coordination shells at least. The main peak of G DD is split up into a contribution at 2.36 A with 5.4 nearest neighbours and a contribution at 2.76 A with 4 neighbours. The D-atoms are located preferentially in Dy 4 -tetrahedra, where the occupation of two neighbouring face-sharing tetrahedra is avoided. 
  Reference    Z. Naturforsch. 53a, 766—770 (1998); received July 6 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0766 
 Volume    53 
110Author    C. B. Azzoni, M. C. Mozzati, A. Paleari, V. Massarotti, M. Bini, D. CapsoniRequires cookie*
 Title    Evidence of a Cationic Substitution Domain in Lithium-Manganese Spinels  
 Abstract    Magnetic susceptibility measurements and electron paramagnetic resonance spectra of samples prepared from the reactive system Mn0/Li 2 C0 3 with different starting Li cationic fraction x are analyzed, taking into account the structural and compositional information provided by x-ray diffrac-tion. Parent phases, as Mn 2 0 3 , Mn 3 0 4 and Li 2 Mn0 3 , arise together with the lithium-manganese spinel as a result of Li-deficiency or Li-excess with respect to the x = 0.33 composition pertinent to the stoichiometric LiMn 2 0 4 spinel. The data show that the spinel phase can sustain a partial Li-Mn substitution in the cation sites, according to compositional models described, for x > 0.33, by Lii +y Mnit 3y Mnf+ 2y 0 4 (Li-rich spinel) and, for x < 0.33, by Lii_| J/ |Mn^|Mn^| y |Mnfi| I/ |0 4 (Li-poor spinel). Paramagnetic resonance data of the Li-poor spinel phase are analyzed to discuss the possible oxidation state of Mn in the tetrahedral site. 
  Reference    Z. Naturforsch. 53a, 771—778 (1998); received June 22 1998 
  Published    1998 
  Keywords    Stoichiometric LiMn 2 0 4 Spinel Phase, Magnetic Susceptibility, Electron Paramagnetic Resonance 
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 Identifier    ZNA-1998-53a-0771 
 Volume    53 
111Author    F. Köksal, İ. Kartal, A. GençtenRequires cookie*
 Title    Electron Paramagnetic Resonance of Cu 2+ Doped Na 2 HAs0 4 -7H 2 0 Single Crystals  
 Abstract    The electron paramagnetic resonance spectra of Cu 2+ doped Na 2 HAs0 4 -7H 2 0 single crystals were studied at room temperature. The results indicate the substitutional entrance of Cu 2+ in two magnetically inequivalent Na + sites. Charge compensation is supposed to be fulfilled by proton vacancies. The spin Hamiltonian parameters were determined. The ground state for Cu 2+ seems to indicate the dominance of the d z 2 orbital and therefore a compression of the distorted octahedron along its C 4v axis. 
  Reference    Z. Naturforsch. 53a, 779—782 (1998); received May 5 1998 
  Published    1998 
  Keywords    EPR, Cu 2+, Sodium Hydrogen Arsenate 
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 Identifier    ZNA-1998-53a-0779 
 Volume    53 
112Author    A. Galstian, M. StockhausenRequires cookie*
 Title    Dielectric Relaxation Study of ZnCl 2 and ZnBr 2 Solutions in Water/DMSO Mixtures  
 Abstract    Dielectric spectra have been measured for the title systems up to 72 GHz at 20 °C with salt concen-trations <1 mol/1. The results are described by a superposition of Debye terms. Two terms are sufficient for binary water/DMSO mixtures, while two additional lower frequency ones are required when salt is added. The results for both halides differ only little. The relaxation strengths of a term ascribable to ion-ic complexes and a term ascribable to water/DMSO (2:1) complexes vary in opposing sense, demon-strating the competition between those complexes. 
  Reference    Z. Naturforsch. 53a, 783—786 (1998); received June 29 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0783 
 Volume    53 
113Author    M. Sandmann, A. WürflingerRequires cookie*
 Title    PVT Measurements on 4'-/i-Octyl-Biphenyl-4-Carbonitrile (8CB) up to 300 MPa  
 Abstract    P, V m , Tdata have been measured for the smectic, nematic and isotropic phases of 4'-n-octyl-biphen-yl-4-carbonitrile (8CB) in the temperature range 300-370 K and pressures up to 300 MPa. At atmos-pheric pressure all phase transitions appear to be of first order due to a discontinuity in the density. The volume change at the smectic A -nematic transition is only a tenth of the volume change at the clear-ing temperature. At moderate pressures below 80 MPa the S A -N transition could be detected as a dis-continuity in the period of oscillation in measurements with a high-pressure vibrating tube densimeter. At higher pressures the discontinuity seems to die away, possibly indicating a change from first order to second order transition. From the volume changes and the slopes of the transition lines we calculate the enthalpy changes at the phase transition. The p, V m , T data enable us to calculate the volume part of the entropy and the molecular field parameter y=9ln 7 N i/3ln V NI . 
  Reference    Z. Naturforsch. 53a, 787—792 (1998); received July 10 1998 
  Published    1998 
  Keywords    8CB, High Pressure, pVT, Phase Transitions, Thermodynamics 
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 Identifier    ZNA-1998-53a-0787 
 Volume    53 
114Author    Alfred Klemm, Lutz SchäferRequires cookie*
 Title    Coion-Interactions in Molten Salt Systems (M 1 ,M 2 )X 3  
 Abstract    The association-model of binary molten salt systems (Mi,M2)X3 is critizised and the friction coefficients ru, 3, and rn of the system (6 Li, 7 Li)Cl are calculated from ancient mobility mea-surements, showing that the coion-interactions, represented by r 12, are about as strong as the ion-counterion-interactions, represented by 7*13 and 7-23. 
  Reference    Z. Naturforsch. 53a, 793—795 (1998); received June 25 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0793 
 Volume    53 
115Author    Hiroyuki IshidaRequires cookie*
 Title    H and 19 F NMR Studies on Molecular Motions in Two Solid Phases of t-Butylammonium Tetrafluoroborate  
 Abstract    Differential thermal analysis (DTA), differential scanning calorimetry (DSC), and the temperature dependence of the spin-lattice relaxation time (T {) and the second moment (M 2) of 1 H and F NMR were studied in (CH3) 3 CNH 3 BF4 and (CH 3) 3 CND 3 BF 4 . DTA and DSC revealed a solid-solid phase transition at 219 K for (CH 3) 3 CNH3BF4 and at 221 K for (CH 3) 3 CND 3 BF 4 . The motions of cations and anions in the two solid phases were studied by T x and M 2 experiments. The motional modes of the ions and their motional parameters were determined. 
  Reference    Z. Naturforsch. 53a, 796—800 (1998); received May 30 1998 
  Published    1998 
  Keywords    Molecular motion, Phase transition, Nuclear magnetic resonance 
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 Identifier    ZNA-1998-53a-0796 
 Volume    53 
116Author    Andrea Gruß, MichaelC. Böhm, Joachim Schulte, Klaus-Peter DinseRequires cookie*
 Title    An ab initio Hartree-Fock Investigation of Endohedral Sc@C  
 Abstract    The electronic structure of endohedral Sc@C 82 with a C 82 cage of C 2v symmetry has been studied by ab initio Hartree-Fock (HF) calculations. The optimized position of Sc in the configuration of minimum energy is predicted to be on the two-fold axis of the fullerene cage. In the corresponding configuration Sc is above the center of a hexagon of site symmetry C 2 . This structure of C 2v symmetry is nearly degenerate with C s and C t structures with Sc slightly displaced from the center of the coordinated hexagon. The binding energy of the endohedral complex is larger than 3.55 eV. The ab initio HF data of the C 2v topoisomer of the fullerene unit are compared with new experimental findings and HF results derived for the 3(C 2) topoisomer of the C 82 cage. 
  Reference    Z. Naturforsch. 53a, 801—805 (1998); received June 12 1998 
  Published    1998 
  Keywords    Endohedral Fullerenes, Electronic Structure, ab initio Calculations 
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 Identifier    ZNA-1998-53a-0801 
 Volume    53 
117Author    Yi-Tian Gao, Bo Tian, Woopyo HongRequires cookie*
 Title    Particular Solutions for a (3+l)-dimensional Generalized Shallow Water Wave Equation  
 Abstract    The shallow water wave equations (SWWEs) are of current interest in nonlinear sciences. In this paper we obtain a new family of soliton-like solutions for a (3-l)-dimensional gener-alized SWWE. Samples are given. 
  Reference    Z. Naturforsch. 53a, 806—807 (1998); received May 8 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0806_n 
 Volume    53 
118Author    Yi-Tian Gao, Bo Tian, Woopyo HongRequires cookie*
 Title    New Exact Solutions for a Generalized Breaking Soliton Equation  
 Abstract    The breaking soliton equations are a class of nonlinear evo-lution equations of broad interest in physical and mathematical sciences. In this paper, the application of the generalized tanh method with symbolic computation leads to new exact solu-tions for a generalized breaking soliton equation, of which the previously-obtained solutions are the special cases. Within a decade, a class of nonlinear evolution equations, called the breaking soliton equations, has Reprint request to Prof. Bo Tian; * Mailing address. 807 where b, c, p and h are constants. Constraint (10) then leads to u(x,y,z,t)= F-a • tanh (17) ax + by + cz + a^-a 2 ^Jt + h 2 ' 
  Reference    Z. Naturforsch. 53a, 807—2848 (1998); received May 8 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0807_n 
 Volume    53 
119Author    M.A M Eid, E. K. Hakim, K. N. Abd-El-Nour, A.L G Saad, M. StockhausenRequires cookie*
 Title    Dielectric Behaviour of Some Pure Normal Alcohols and their Binary Mixtures  
 Abstract    The pure 1-alkanols C 4 to C 12 and seven of their short/long chain binary equimolar mixtures are in-vestigated by static and dynamic dielectric measurements up to 36 GHz at 20, 30 and 40 °C. The appar-ent dipole moment and the relaxation parameters from a three Debye term analysis of the spectra are discussed. The mixtures are found to behave like a one component alcohol of mean chain length. An odd-even effect is revealed by comparison of mixtures containing C n with those containing C 12 as long chain mixture component. 
  Reference    Z. Naturforsch. 53a, 809—812 (1998); received September 2 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0809 
 Volume    53 
120Author    Danuta Bauman, Ewa Chrzumnicka, Roman Dąbrowski, Jan JadżynRequires cookie*
 Title    Study of Azo Dye-/iTPEB Mixtures in the Nematic and Smectic B Phases by Means of Polarized Light Absorption  
 Abstract    The influence of the dichroic azo dye on the phase transition temperatures of the mesogenic homolo-gous series of l-[4-n-alkyl-biphenyl]-2-[4-isothio-cyanatophenyl] ethane (nTPEB) for n = 2 -10 has been examined. For the dye-nTPEB mixtures the polarized absorption spectra as a function of tem-perature have been recorded. From these spectra the order parameter of the dye dissolved in the liquid crystalline hosts in the whole region of the nematic phase has been determined. The order parameter has revealed the odd-even alternation, similarly as the clearing temperature. In the smectic B phase the mosaic texture has been observed and conclusions concerning structural form of this phase have been drawn. 
  Reference    Z. Naturforsch. 53a, 813—818 (1998); received June 16 1998 
  Published    1998 
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 Identifier    ZNA-1998-53a-0813 
 Volume    53 
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