Photodissociation of H-2(+) in intense chirped laser fields - art. no. 013408

Regarding an experimental measurement of proton kinetic energy spectra of H -2(+) with a chirped pulse [L. J. Frasinski, J. H. Posthumus, J. Plumridge, and K. Golding, Phys. Rev. Lett. 83, 3625 (1999)], we present a nonperturb ative, time-dependent calculation for the photodissociation of H-2(+) in in tense laser fields by combining three numerical techniques. The results sho w a finer kinetic-energy distribution structure of a proton due to the intr apulse pump-dump mechanism between two electronic states as the pulse durat ion and intensity change. Higher-energy peaks are also suppressed by freque ncy chirping of the laser field. The dissociation probabilities show that a positively chirped pulse is always more efficient for population inversion than no chirping or negatively chirped pulses, and a slight coordinate shi ft of the initial state could result in a significant increase of dissociat ion probability.