Phonon Raman spectra, molecular motions, and phase transitions of dimethylacetylene crystal

Paras N. Prasad; Raoul Kopelman

doi:10.1016/0009-2614(73)80487-7

Phonon Raman spectra, molecular motions, and phase transitions of dimethylacetylene crystal

Paras N. Prasad
, Raoul Kopelman

Chemistry

University of Michigan, Ann Arbor

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The phonon Raman spectra of crystals of dimethylacetylene, perdeutero-dimethylacetylene and their mixtures have been investigated down to 20°K. The high temperature phase shows only one line and the low temperature phase only two. Neither of these is related to the R_z (methyl) rotation, which seems to remain practically free. However, the latter motion is found to be restricted in a newly discovered metastable phase, which is reported here first, displaying 5-6 phonon bands. The well-known λ-point transition appears little related to methyl rotations. The internal rotation of dimethylacetylene seems to stay practically free down to 20°K in the stable phases.

Original language	English
Pages (from-to)	513-516
Number of pages	4
Journal	Chemical Physics Letters
Volume	20
Issue number	6
DOIs	https://doi.org/10.1016/0009-2614(73)80487-7
State	Published - Jul 15 1973

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title = "Phonon Raman spectra, molecular motions, and phase transitions of dimethylacetylene crystal",

abstract = "The phonon Raman spectra of crystals of dimethylacetylene, perdeutero-dimethylacetylene and their mixtures have been investigated down to 20°K. The high temperature phase shows only one line and the low temperature phase only two. Neither of these is related to the Rz (methyl) rotation, which seems to remain practically free. However, the latter motion is found to be restricted in a newly discovered metastable phase, which is reported here first, displaying 5-6 phonon bands. The well-known λ-point transition appears little related to methyl rotations. The internal rotation of dimethylacetylene seems to stay practically free down to 20°K in the stable phases.",

author = "Prasad, \{Paras N.\} and Raoul Kopelman",

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doi = "10.1016/0009-2614(73)80487-7",

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journal = "Chemical Physics Letters",

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T1 - Phonon Raman spectra, molecular motions, and phase transitions of dimethylacetylene crystal

AU - Prasad, Paras N.

AU - Kopelman, Raoul

PY - 1973/7/15

Y1 - 1973/7/15

N2 - The phonon Raman spectra of crystals of dimethylacetylene, perdeutero-dimethylacetylene and their mixtures have been investigated down to 20°K. The high temperature phase shows only one line and the low temperature phase only two. Neither of these is related to the Rz (methyl) rotation, which seems to remain practically free. However, the latter motion is found to be restricted in a newly discovered metastable phase, which is reported here first, displaying 5-6 phonon bands. The well-known λ-point transition appears little related to methyl rotations. The internal rotation of dimethylacetylene seems to stay practically free down to 20°K in the stable phases.

AB - The phonon Raman spectra of crystals of dimethylacetylene, perdeutero-dimethylacetylene and their mixtures have been investigated down to 20°K. The high temperature phase shows only one line and the low temperature phase only two. Neither of these is related to the Rz (methyl) rotation, which seems to remain practically free. However, the latter motion is found to be restricted in a newly discovered metastable phase, which is reported here first, displaying 5-6 phonon bands. The well-known λ-point transition appears little related to methyl rotations. The internal rotation of dimethylacetylene seems to stay practically free down to 20°K in the stable phases.

UR - https://www.scopus.com/pages/publications/0345456540

U2 - 10.1016/0009-2614(73)80487-7

DO - 10.1016/0009-2614(73)80487-7

M3 - Article

AN - SCOPUS:0345456540

SN - 0009-2614

VL - 20

SP - 513

EP - 516

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 6

ER -

Phonon Raman spectra, molecular motions, and phase transitions of dimethylacetylene crystal

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