Controlling strong-field fragments of HD+ with a synthesized two-color laser pulse

Abstract

The possibility of controlling fragment branching in the dissociation and ionization channels of HD⁺ is theoretically explored by synthesized intense fields using 790 nm and 395 nm pulses. In the control scheme, the branching ratios of the fragments to different channels (H + D⁺, D + H⁺ and H⁺ + D⁺) are manipulated by regulating the relative phase and intensity between the 790 nm and 395 nm pulses. Altering the relative phase can induce constructive or destructive interference between the net two photon process and the direct one photon process, and the highest modulation reaches 80% between the two dissociation fragments (H + D⁺ and D + H⁺). The high selectivity of the ionization fragment (H⁺ + D⁺) is achieved by tuning the relative intensity, since the ionization rate is not only related to the internuclear distance, but also to the instantaneous intensity of field strength. The results demonstrate that the synthesized ω–2ω laser pulse can provide an efficient control over the strong-field fragments of HD⁺.