Reorientations in crystalline (CH3)3NHCl studied by quasielastic neutron scattering
- 1 January 1977
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 33 (1) , 111-123
- https://doi.org/10.1080/00268977700103091
Abstract
Reorientations of the CH3 groups and of the cation are studied in the two phases (phase transition at 308 K) of (CH3)3NH+Cl- by quasielastic neutron scattering using a time of flight and a backscattering instrument. In the high temperature phase the experimental results can be described by rotational diffusion of the cation around its threefold axis with D r = 0·49 × 1012 s-1 (τc = 1/D r = 2·05 ¢ 10-12 s) at 333 K. The reorientation of the methyl groups is too slow to produce in this phase a quasielastic broadening detectable by the time of flight experiment. In the low temperature phase the observed spectra can be explained by simultaneous 120° jumps of the cation and of the methyl groups. The correlation times for the two reorientations are about the same: τc ≈ 4 × 10-10 s at 273 K.Keywords
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