Librational motions in dimethylacetylene studied by inelastic neutron scattering
作者:
K.J. Tilli,
B. Alefeld,
期刊:
Molecular Physics
(Taylor Available online 1978)
卷期:
Volume 36,
issue 1
页码: 287-298
ISSN:0026-8976
年代: 1978
DOI:10.1080/00268977800101571
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The librational motions of the methyl groups in solid dimethylacetylene at 4·8 K have been studied by inelastic incoherent neutron scattering. The observed libron density of states exhibits well-defined peaks, which have been compared with the theoretical results calculated with the time-dependent Hartree approximation using a simple model including only methyl librations about the C-C axes of the molecule. A close agreement between the experimental and calculated results was obtained by using a librational potentialV1c/2 >cos 3α +V2c/2 >cos 6α with the parametersV1c= - 43·3 ± 1·7 meV andV2c= -3·5 ± 1·7 meV.
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