Fine band structure of the vibrational spectra of fullerite C60 and enhancement of intermolecular interaction in high-temperature phase

Autor:	N. E. Kornienko, Sergei Alekseev, E. L. Pavlenko, O. P. Dmitrenko, N. P. Kulish
Rok vydání:	2010
Předmět:	Materials science Atomic and Molecular Physics and Optics Spectral line Hot band Electronic Optical and Magnetic Materials symbols.namesake Crystal field theory Phase (matter) Molecular vibration symbols Atomic physics Electronic band structure Raman spectroscopy Excitation
Zdroj:	Optics and Spectroscopy. 109:742-752
ISSN:	1562-6911 0030-400X
Popis:	The fine structure of the fundamental vibrational bands and some combination tones of fullerite C60 in its IR absorption and reflection spectra, as well as in Raman spectra, has been studied. This structure is due to the overlapping components of Davydov and isotopic splittings and the removal of vibrational degeneracy with symmetry lowering. It is shown that for IR Fu(i) bands (i = 1–4) and low-frequency Hg(1) and Ag(1) bands in the Raman spectrum the splittings at room temperature exceed those for the low-temperature phase. The enhancement of intermolecular interaction at elevated temperatures is explained by the nonequilibrium vibrational excitation of the medium as a result of nonlinear interaction of vibrational modes and by the change in the electronic states.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f5a0ec79d41deabc2b60ea78d339e4e4 https://doi.org/10.1134/s0030400x10110147 Zobrazit plný text záznamu Plný text ve formátu PDF