Vibrational relaxation of Davydov components of the 940 cm-1 mode in KClO4 crystal

Year: 1990

Authors: Bini R., Foggi P., Salvi P.R., Simone R., Schettino V.

Autors Affiliation: Dipartimento di Chimica, Universita\’ di Firenze, 50121 Firenze, Italy

Abstract: We report on the temperature dependent linewidth of the B3u component of gn1 mode in KClO4 crystal measured by FTIR spectroscopy. These results are compared with previous ones obtained for the Ag component. At temperatures higher then 80 K both components have a linear dependence on T showing that three-phonon scattering relaxation processes are driving the decay of this mode. The difference in the residual linewidths at low temperature (20 K) is interpreted in terms of different anharmonic couplings between the two componens and the thermal bath.

Journal/Review: JOURNAL OF MOLECULAR STRUCTURE

Volume: 219 (C)      Pages from: 43  to: 48

More Information: Consiglio Nazionale delle Ricerche, CNR. College of Natural Resources, University of California Berkeley, CNR, Minister0. Ministry of Primary Industries, MPI. – ACKNOWLEDGMENT This work was supported by the Italian Consiglio Nazionale delle Ricerche (CNR) and Minister0 della Pubblica lstruzione (MPI). The authors wish to thank the mechanical shop staff of the ChemistryD epartmentwho made the projecta nd the realizationo f the N2-purged chamber.
KeyWords: potassium perchlorate
DOI: 10.1016/0022-2860(90)80029-J

Citations: 7
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