Abstract
We study the dynamics of the molecular ion induced by a strong IR laser pulse. The ground potential curve of supports resonant states which tunnel to dissociative channels. The resolvent operator method (ROM) is used to extract both the resonance parameters of the field-free molecular ion and to investigate the dissociation dynamics when an IR field is applied. The resonance energies and widths obtained using the ROM are in agreement with previous calculations and other approaches. The dynamics of photodissociation is thoroughly investigated, and the role of the resonances in the differential photodissociation spectra is discussed. Similarly, the evolution of the average value of the internuclear distance has been investigated. We show in particular that the increase of the internuclear distance at the early time of the laser–molecule interaction is directly related to the sign of the derivative of the polarizability at the equilibrium internuclear distance.
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