SER SPECTRA ANALYSIS OF MOLECULES WITH D-3H AND D-6H SYMMETRY GROUPS

On the basis of the theory of SER spectra, proposed in a previous pape r, the SER spectra of 1,3,5-trifluorobenzene, 1,3,5-trideuteriobenzene , benzene and hexafluorobenzene are analysed. It is demonstrated that the bands, caused by the totally symmetric modes and by the mode trans forming as the d(z) moment experience large enhancement. The existence of a large number of forbidden bands in the SER spectra is pointed ou t. Some anomalies in the enhanced spectra are explained by qualitative ideas and by the 'interference phenomenon' of various contributions. It is pointed out that all the observed lines and regularities of the SER spectra can be explained within the framework of the quadrupole an d dipole electrodynamical mechanism of the enhancement.