Recent investigations of infrared laser induced chemical reactions are reviewed with parti-cular emphasis on the mechanism of collisionless multiphoton dissociation of molecules. The experimental results of isotope separation performed by TEA CO
2 laser irradiation of SF
6 reported in a number of papersand our research of the infrared photoreaction of C
2F
3Cl are described indetail. Theoretical analysis of the dissociation based on the RRKM model ofunimolecular reaction suggests that the exciation energy in SF
6 is completely randomized in all its vibrational modes, while in C
2F
3Cl the absorbed energy is localized in a small number of vibrational modes.
Furthermore, intensive and extensive studies of isotopeseparation, chemical reactions and isomerizations, carried out by using the infrared laser, are also reported. Itis briefly mentioned that CW infrared laser irradiation gives rise to collectiveexcitation of molecules, producing chemical reaction in liquid state.
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