  It is demonstrated, that the forbidden lines, which were observed in the
SEIRA spectra of diprotonated BiPyH22+ and ethylene, adsorbed on Cu, as well as
on ethylene, adsorbed on mordenites can be explained on the base of the
Dipole-Quadrupole theory of SEIRA and is the consequence of the existence of
the strong quadrupole light-molecule interaction.

Optics;Materials Science