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Titolo:
STUDY OF MOLECULAR MOTIONS IN 2-ADAMANTANONE BY NUCLEAR-MAGNETIC-RESONANCE
Autore:
DECRESSAIN R; AMOUREUX JP; COCHON E;
Indirizzi:
UNIV LILLE 1,DYNAM & STRUCT MAT MOLEC LAB,CNRS,URA 801,BAT P5 F-59655VILLENEUVE DASCQ FRANCE
Titolo Testata:
Physica status solidi. b, Basic research
fascicolo: 1, volume: 190, anno: 1995,
pagine: 295 - 306
SICI:
0370-1972(1995)190:1<295:SOMMI2>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
REORIENTATIONS; CRYSTALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
R. Decressain et al., "STUDY OF MOLECULAR MOTIONS IN 2-ADAMANTANONE BY NUCLEAR-MAGNETIC-RESONANCE", Physica status solidi. b, Basic research, 190(1), 1995, pp. 295-306

Abstract

The temperature dependence of proton and carbon spin-lattice relaxation rates in 2-adamantanone is measured. The present experiments are analyzed in terms of relaxation resulting from intramolecular reorientation modulation of the spin-spin interaction. In the plastic phase the molecular reorientations involve a superposition of uniaxial rotation and tumbling reorientation of the dipolar axis. The calculation of thecorresponding autocorrelation function is made by using a Frenkel model. The resulting expression for T-1 leads to a determination of the plastic phase residence times in good agreement with values previously deduced from quasi-elastic neutron scattering and dielectric relaxation. In the low-temperature phase the motions are completely frozen and T-1 is rather constant.

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Documento generato il 19/09/20 alle ore 07:51:28