Abstract

Multiphoton ionization of CO 2 via three-photon resonances with the ( 2П g,Ω )n f Rydberg states results in production of CO + 2, CO +, and O + ions. This study explores the branching into CO + 2 and CO + ion channels and its laser power dependence for the levels nf = 5–7. The results indicate that either a significant fraction of the CO + 2 ions produced in the initial ionization step do not participate in a dissociative two-photon transition or that dissociation of low vibrational levels of the parent ion occurs by a transition to a state with a lifetime on the order of 600 ps. A method of measuring predissociation lifetimes by determining the fraction of population which survives a saturated transition to a dissociative state is suggested.

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