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'Molecular dynamics' in keywords Facet   section ZfN Section A  [X]
Facet   Publication Year 1993  [X]
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1993[X]
1Author    B.V S Murthy, K. P. Ramesh, J. RamakrishnaRequires cookie*
 Title    Molecular Dynamics in Tetramethyl Ammonium Hexabromo Selenate [N(CH 3 ) 4 ] 2 SeBr 6 . A Proton NMR Study  
 Abstract    spin-lattice relaxation time Ti and second moment M 2 have been studied as a function of tem-perature over the temperature range 445 to 77 K. A discontinuous change in Ti at 365 K, in-dicates the presence of a phase transition, while the slope change at 152 K, is attributed to a change in the TMA ion dynamics from tumbling to torsion. The 7i results could be explained in terms of inequivalent TMA ions and their small angle torsional oscillations. A second moment (M 2) transition occurs around 160 K and is ascribed to the freezing of TMA tumbling and CH 3 reorientation. 
  Reference    Z. Naturforsch. 48a, 868—870 (1993); received February 22 1993 
  Published    1993 
  Keywords    Molecular dynamics, Second moment, NMR, Spin-lattice relaxation time 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0868.pdf 
 Identifier    ZNA-1993-48a-0868 
 Volume    48 
2Author    J. Jadżyn, G. Czechowski, B. Żywucki, C. Legrand, P. Bonnet, R. DąbrowskiRequires cookie*
 Title    Dielectric Properties of Mesomorphic n-TPEB's in Isotropic Phase  
 Abstract    Dielectric relaxation studies have been performed for the isotropic phase of a series of mesogenic molecules of l-[3-n-alkyl-biphenyl]-2-[4-isothiocyanatophenyl]ethane, CnH 2n+ 1 -(f)-(t>-CH 2 CH 2 -<p-NCS (n-TPEB), for n = 7, 8 and 9. Two Debye-type dielectric absorption bands have been interpreted as corresponding to the rotation around the short and long molecular axis. 
  Reference    Z. Naturforsch. 48a, 871—874 (1993); received May 29 1993 
  Published    1993 
  Keywords    Dielectric relaxation, Molecular dynamics, Mesomorphic molecules, Relaxation time, Activation energy 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0871.pdf 
 Identifier    ZNA-1993-48a-0871 
 Volume    48