Withdrawal of Electrodynamical Forbiddance and Peculiarities of the SERS Spectra in Fullerene C70

Abstract

It is demonstrated that in fullerene C70, which can be considered as a deformed fullerene C60 in some mean sense there is a withdrawal of an Electrodynamical forbiddance of a strong quadrupole light-molecule interaction, which is realized in the fullerene C60. This situation occurs because of the reduction of symmetry of C60 from the icosahedral symmetry group Yh to the group D5h. The withdrawal results in appearance of the lines in the SERS spectra of C60, which are forbidden in usual Raman scattering and are active in the infrared absorption spectra. The experimentally measured SERS spectra of C70 demonstrates existence of such lines that strongly confirms our ideas about the dipole-quadrupole SERS mechanism.