| Autor: |
W. Longueville, J.P. Amoureux, M. Bée, R. Fouret |
| Rok vydání: |
1986 |
| Předmět: |
|
| Zdroj: |
Journal de Physique. 47:291-304 |
| ISSN: |
0302-0738 |
| DOI: |
10.1051/jphys:01986004702029100 |
| Popis: |
Reorientations of the pivalic acid molecule and/or of its parts have been studied in the two solid phases (phase transition at 279.9 K) by incoherent quasielastic neutron scattering (IQNS). Different jump-models are developed for comparison with the experimental results. For methyl-group or carboxylic-group motion, simple reorientational jump models among N sites over a circle can be used. When t-butyl rotations together with internal methyl rotations occur simultaneously, a more sophisticated jump model is developed based upon dynamically uncorrelated reorientational motions about two different axes. Finally we consider the case when a tumbling motion of the whole-molecule is added to the two previous motions and an approximate scattering law is also derived Developpement de differents modeles de saut. Utilisation des modeles de sauts de reorientation simples sur N sites egalement repartis sur un cercle, pour le mouvement du groupement methyle ou celui du groupe carboxylique |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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