The frequency and the bandwidth of the 12 Raman active lattice modes and of more than 45 internal vibrons of natural and 12C isotopically pure benzene have been measured under high resolution with the aid of a tandem interferometer-spectrometer system or alternatively of a two meter focal length grating Sopra spectrometer. For five lattice phonons and for several vibrons the measurements were extended to a sufficient temperature range to study the relaxation processes in terms of anharmonic phonon-phonon and phonon-vibron coupling processes. The effect of the isotopic impurities on the phonon lifetime has been shown to be very important for some vibrons, in particular, for those resonant with the impurity level. The bandwidth evolution with temperature has been interpreted in terms of down- and up- three- and four-phonon as well as of dephasing processes.

High resolution Raman study of phonon and vibron bandwidths in isotopically pure and natural benzene crystal / J. P. PINAN; R. OUILLON; P. RANSON; M. BECUCCI; S. CALIFANO. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - STAMPA. - 109:(1998), pp. 5469-5480. [10.1063/1.477165]

High resolution Raman study of phonon and vibron bandwidths in isotopically pure and natural benzene crystal

BECUCCI, MAURIZIO;CALIFANO, SALVATORE
1998

Abstract

The frequency and the bandwidth of the 12 Raman active lattice modes and of more than 45 internal vibrons of natural and 12C isotopically pure benzene have been measured under high resolution with the aid of a tandem interferometer-spectrometer system or alternatively of a two meter focal length grating Sopra spectrometer. For five lattice phonons and for several vibrons the measurements were extended to a sufficient temperature range to study the relaxation processes in terms of anharmonic phonon-phonon and phonon-vibron coupling processes. The effect of the isotopic impurities on the phonon lifetime has been shown to be very important for some vibrons, in particular, for those resonant with the impurity level. The bandwidth evolution with temperature has been interpreted in terms of down- and up- three- and four-phonon as well as of dephasing processes.
1998
109
5469
5480
J. P. PINAN; R. OUILLON; P. RANSON; M. BECUCCI; S. CALIFANO
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/250087
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 20
  • ???jsp.display-item.citation.isi??? 16
social impact