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The paper demonstrates possibility of giant enhancement of Surface EnhancedHyper Raman Scattering on the base of qualitative consideration ofelectromagnetic field near some models of rough metal surfaces and of somefeatures of the dipole and quadrupole light-molecule interaction, such as itwas made in the dipole-quadrupole SERS theory. Consideration of symmetricalmolecules allows to obtain selection rules for their SEHR spectra and establishsuch regularity as appearance of the bands, caused by the totally symmetricvibrations, transforming after the unitary irreducible representation inmolecules with C2h,D and higher symmetry groups, which are forbidden in usualHRS spectra. Analysis of literature data on trans-1,2-bis (4-pyridyle) ethyleneand pyridine molecules demonstrates that their SEHR spectra can be explained bythe SEHRS dipole-quadrupole theory, while analysis of the SEHR spectrum ofpyrazine reveals appearance of the strong forbidden bands, caused by vibrationstransforming after the unitary irreducible representation that stronglyconfirms this theory which permits to interpret the whole SEHR spectrum indetail. The results corroborate this common mechanism of Surface Enhancedoptical processes on molecules adsorbed on rough metal surfaces.

Manifestation of the strong quadrupole light-molecule interaction in the SEHR spectra of symmetrical molecules