VIBRATIONAL DENSITY-OF-STATES AND HOMOGENEOUS LINEWIDTH IN MOLECULAR-CRYSTALS - MANY-PHONON PROCESSES IN NITROGEN

Citation
Rg. Dellavalle et al., VIBRATIONAL DENSITY-OF-STATES AND HOMOGENEOUS LINEWIDTH IN MOLECULAR-CRYSTALS - MANY-PHONON PROCESSES IN NITROGEN, Physical review. B, Condensed matter, 55(22), 1997, pp. 14855-14864
Citations number
38
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
0163-1829
Volume
55
Issue
22
Year of publication
1997
Pages
14855 - 14864
Database
ISI
SICI code
0163-1829(1997)55:22<14855:VDAHLI>2.0.ZU;2-1
Abstract
This paper summarizes, simplifies, and extends some recent development s in the theory of phonon damping in anharmonic crystals. We propose a n approach in which the damping is described in terms of two ingredien ts: (1) a computed or estimated one-phonon density of states, and (2) average anharmonic couplings between the phonons, fitted to the experi mental temperature dependence of the phonon damping. Solid nitrogen is chosen as a test case and the coupling coefficients obtained from the fit are correlated to the three-, four-, and five-phonon couplings co mputed from a potential model.