| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|---|---|---|
| Page(s) | C6-34 - C6-36 | |
| DOI | https://doi.org/10.1051/jphyscol:1981609 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-34-C6-36
DOI: 10.1051/jphyscol:1981609
1 Joint Institute for Nuclear Research, 141980, Dubna, USSR
2 Institute of Solid State Physics, Acad. of Sciences of the USSR, 142432 Chernogolovka, USSR
J. Phys. Colloques 42 (1981) C6-34-C6-36
DOI: 10.1051/jphyscol:1981609
VIBRATIONAL DENSITY OF STATES OF AMORPHOUS AND CRYSTALLINE LIQUID CRYSTAL SUBSTANCES
A.V. Bielushkin1, I. Natkaniec2, V.K. Dolganov2 et E.F. Sheka21 Joint Institute for Nuclear Research, 141980, Dubna, USSR
2 Institute of Solid State Physics, Acad. of Sciences of the USSR, 142432 Chernogolovka, USSR
Abstract
We have measured by the TOF neutron spectroscopy method the amplitude-weighted frequency distribution function of the glassy and crystalline phases of the EBBA, MBBA and PAA compounds. Evident changes in the vibrational density of states in the frequency range up to 300 cm-1 are observed when passing from the amorphous to ordered crystalline phases. The partly deuterated d6-PAA spectrum have shown that these vibrations are due to translational and librational motions of the whole molecule and due to low frequency oscillations of the end groups of the molecule.