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Raman phonon spectra and lattice dynamics of 7-methoxycoumarin under pressure

✍ Scribed by A. Brillante; R.G. Della Valle; E. Venuti

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
470 KB
Volume
246
Category
Article
ISSN
0009-2614

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✦ Synopsis

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 are discussed with reference to the mechanism of the non-topochemical photodimerization which is confirmed to occur via defect sites of the crystal rather than as a phonon-assisted process.

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