RAMAN PHONON-SPECTRA AND LATTICE-DYNAMICS OF 7-METHOXYCOUMARIN UNDER PRESSURE

Citation
A. Brillante et al., RAMAN PHONON-SPECTRA AND LATTICE-DYNAMICS OF 7-METHOXYCOUMARIN UNDER PRESSURE, Chemical physics letters, 246(6), 1995, pp. 619-625
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
ISSN journal
0009-2614
Volume
246
Issue
6
Year of publication
1995
Pages
619 - 625
Database
ISI
SICI code
0009-2614(1995)246:6<619:RPALO7>2.0.ZU;2-D
Abstract
Raman phonon spectra of 7-methoxycoumarin in the lattice phonon region have been measured in the range 0-5 GPa. A model atom-atom Buckingham potential has been determined to calculate structural parameters and Raman-active lattice phonons at ambient conditions and under pressure up to 14 GPa. The agreement with experiment is satisfactory. Results a re discussed with reference to the mechanism of the non-topochemical p hotodimerization which is confirmed to occur via defect sites of the c rystal rather than as a phonon-assisted process.