| Autor: |
E. I. Mukhtarov, G. N. Zhizhin, Yu. N. Krasjukov, N. V. Sidorov |
| Rok vydání: |
1983 |
| Předmět: |
|
| Zdroj: |
Molecular Crystals and Liquid Crystals. 90:185-194 |
| ISSN: |
0026-8941 |
| DOI: |
10.1080/00268948308072448 |
| Popis: |
The temperature dependence of Raman spectra (temperature maintained within ±0.01°) in the premelting region of naphthalene, benzene, thiophene, phenanthrene, anthracene and p-dichlorobenzene (β-modification) have been investigated. Normal-mode calculations have been performed using atom-atom potentials. The jump-like intensity decreasing and disappearance of v 5(A g) and v 6 (B g) lines (librations around the axis close to the axis with the smallest moment of inertia) in comparison with other lines of the phonon spectrum have been observed in premelting region of naphthalene. This is due to the activation of naphthalene molecular reorientations about corresponding axis. Gradual broadening, decrease of intensity and disappearance of some lines in the phonon spectrum is characteristic of benzene and thiophene. Complete disappearance of the phonon spectrum of thiophene has been observed near the melting point. This is related to disorder of all molecular orientations in crystal. The phonon spectra o... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
