Strong Vibration-Electron Interactions and Vibration Band Enhancement in Vibrational Spectra of C60 Nanofilms and Singlewalled Carbon Nanotubes

Abstract

In Raman spectra in nanofilms of fullerene C60 with thickness about 150 – 250 nm it was found the en-hancement of vibrational bands Hg (1 ÷ 8) intensity at 2 ÷ 7 times in comparison with the microfilms with thickness 1 – 2 microns. It is shown that the inactive for icosahedral symmetry Ih Raman and IR vibrations Gg, u, Hu, F2g, u, and the lateral spectral components of the bands Hg (1 ÷ 8) increase in 5 – 50 times and more. This is due to an abnormal increasing of the resonant nonlinear interaction of the vibrational modes and the vibrational-electronic interaction, which leads to a change in the electronic states and the appear-ing of new electronic bands (EB) in the region of the vibrations. The change induced by the polymerization of EB in nanofilms C60 and intense laser pulses have been studied. . A nonmonotonic dependence of the EP intensity on the thickness of nanofilms has been established. The lineshape of the overtones 2Ag (2) and 2Hg (7) for fullerene C60 and increasing of overtone 2D in spectra of single-walled carbon nanotubes, as well as unusual changes anharmonisity their 2G and 2D bands varies with the frequency of the laser radi-ation have been studied. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35593