Abstract
Calculations on the infrared multiphoton dissociation of a model linear triatomic molecule are reported. The molecule has 51 bound states and dissociation occurs after absorption of at least ten photons. The dissociation probability is computed within the quantum framework of the optical potential method [C. Leforestier and R. E. Wyatt, J. Chem. Phys. 78, 2334 (1983)] in conjunction with the complex extension of Floquet theory. For any given frequency, an analysis of the molecule in interaction with the laser field is presented, which permits us to follow the entire excitation path up to the continuum. This analysis shows that excitation into the continuum proceeds primarily through Feshbach resonant states. The role of these resonant states in the dissociation of polyatomic systems is discussed.
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