Abstract
The dissociation dynamics of molecular ion HD+ in two completely overlapping THz and infrared pulses are investigated by using the time-dependent quantum wave packet method. The angular distribution of fragments depends on the carrier-envelope phase (CEP) of the THz pulse. The infrared pulse is employed to control the dissociation probability and the direction of the products D+H+. When the intensity of infrared pulse is 2.0×1014 W/cm2, the molecule HD+ is pre-oriented by the THz pulse and most of products D+H+ and H+D+ are distributed in the same direction. When the intensity is increased to 4.6×1014 W/cm2, the angular distribution is mainly generated by the THz pulse after molecular ions are dissociated, and the direction of products D+H+ is opposite to that of products H+D+.
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