Abstract
The dissociation dynamics of H+2 in an intense ultrashort-pulsed laser light field (λ = 800 and 1200 nm, Γ = 100 fs, I = 1012–1014 W cm−2) is investigated by the quasi-stationary Floquet approach. The time-dependent dynamics of the dissociating wavepacket whose fate is governed mostly by the propagation through the one-photon and three-photon crossings are sensitively dependent on the characteristics of the light field such as the wavelength, temporal width and intensity. It is shown that the momentum distribution of the H+ fragment can be decomposed into the three Floquet channels having the dressed photon numbers (n = 0, 1, 2), leading to the secure assignment of the observed peak profiles of the momentum distribution of H+, and that the yield ratios of these three Floquet channels can be manipulated largely by preparing H+2 in a specific vibrational level prior to the interaction with the intense laser field.
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