The dissociation model of polyatomic molecule induced by infrared laser field

The paper discusses the mechanism of multiphoton dissociation of polyatomic molecules in an intense infrared laser field, and derives nonlinear equations which describe the coupling between molecular vibrational modes. The energy transfer time between modes, the Fermi resistance interaction, and the degree of mode excitation by laser field are calculated numerically using the SF6 molecule as an example. Finally, the dissociation rate of a polyatomic molecule is discussed based on the unimolecular reaction model. The theoretical results are in agreement with the experiments.