Vm. Agranovich et Oa. Dubovsky, FERMI RESONANCE INTERFACE MODES IN ORGANIC MULTILAYER STRUCTURES, Chemical physics letters, 210(4-6), 1993, pp. 458-462
Due to intermolecular anharmonicity a new type of vibrational as well
as electronic excitation arises in the vicinity of the interface of tw
o organic crystals for which the condition of Fermi resonance (2omega1
almost-equal-to omega2) takes place, where omega1 and omega2 are eige
nfrequencies of contacting crystals.