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Molecular dynamics in tetramethylammonium hexabromoselenate $[N(CH_3)_4]2SeBr(6)$. A proton NMR study

Murthy, BVS and Ramesh, KP and Ramakrishna, J (1993) Molecular dynamics in tetramethylammonium hexabromoselenate $[N(CH_3)_4]2SeBr(6)$. A proton NMR study. In: Zeitschrift fuer Naturforschung, A: Physical Sciences, 48 (8-9). pp. 868-870.

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$^1H$ spin-lattice relaxation time $T_1$ and second moment M2 have been studied as a function of temperature over the temperature range 445 to 77 K. A discontinuous change in $T_1$ at 365 K, indicates 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 $T_1$ results could be explained in terms of inequivalent TMA ions and their small angle torsional oscillations. A second moment (M2) transition occurs around 160 K and is ascribed to the freezing of TMA tumbling and $CH_3$ reorientation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to the Verlag der Zeitschrift für Naturforschung.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Kiran Savanur
Date Deposited: 30 Jun 2008
Last Modified: 27 Aug 2008 13:31
URI: http://eprints.iisc.ac.in/id/eprint/14717

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