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Principles of grazing incidence SID and a brief overview of previous works are summarized and the experimental setup for grazing incidence SID experiments is described. New results with fullerene C(60) are presented; these demonstrate that grazing incidence SID is not a special case of the conventional SID.

A theoretical approach to the dissociation and low-energy electronic excitation of polyatomic organic molecules with donor and acceptor substructures is suggested. The donor hydrocarbon molecular substructures can serve as antennas for low-energy infrared (IR)-photon absorption, which coherently induce collective vibrational excitations (excimols). Due to dipole-dipole interactions, the accumulated energy can transit to the molecular acceptors: dipole-type trap-bonds or molecular parts with π-electron orbits. The analytical expressions for the probability functions of molecular fragmentation and electronic excitation induced by IR-multiphoton absorption are derived. The vibrational energy accumulation and redistribution in the molecules of diphenylalkanes irradiated by infrared photons are considered from the presented point of view.

A theoretical model is presented, which describes the collision of two polyatomic organic molecules grazing each other at relative velocities below Bohr velocity. If the interacting molecules contain chains of diatomic dipoles, each of these chains can acquire and accumulate IR energy quanta by transition into collective excited vibrational states (excimols) during the contact period (∼ 10 −12 s). The excimol energy transport from one of the chains to close trap-bonds (energy acceptors) of the molecule as well as the energy exchange processes between the two molecules can lead to their fragmentation or electronic excitation. The probability functions of all mentioned processes were derived and presented in analytical form.