Low Temperature Physics: 38, 854 (2012); https://doi.org/10.1063/1.4752103 (9 pages)
Fizika Nizkikh Temperatur: Volume 38, Number 9 (September 2012), p. 1077-1087 ( to contents , go back )
Raman scattering in nonpolymerized and photopolymerized C60 films at 5 K
A.V. Peschanskii, A.Yu. Glamazda, V.I. Fomin, and V.A. Karachevtsev
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
Received April 8, 2012
The Raman spectra of nonpolymerized and photopolymerized fullerene films (of various polymerization degree) have been studied at 5 K in the 250–1590 cm–1 range. It is found that the Raman spectra of the nonpolymerized film display the splitting of lines corresponding to Ag and Hg vibrational modes of the free C60 molecule which is induced by the crystal filed of the low-temperature phase. As to the photopolymerized fullerene film, its Raman spectra exibit pronounced lines corresponding to Ag(2) vibrations of monomers, dimers and linear chains and this is due to high spectral resolution and low temperature. Based on the analysis of the spectra of photopolymerized films of various polymerization degrees (~45, ~85, ~95%), the spectra evolution in the region of molecular modes of fullerene was studied with varying polymerization degree. It is found that in films of high polymerization degree (~85, ~95%) dominant are polymer linear chains whereas in the film of lower polymerization degree (~45%) dominant are dimers. An inercase of polymerization degree, entails a significantshift has not been observed for the lines frequency increase (~2.8 cm–1) of Ag(2) mode of the fullerene monomer, induced by changes in its environment upon the transition from nonpolymerization to photopolymerization films. Such a corresponding to the fullerene photopolymer.
PACS: 78.30.–j Infrared and Raman spectra;
Key words: fullerene films, photopolymerization, low temperature spectroscopy, Raman spectroscopy.