Steering dissociation of Br2 molecules with two femtosecond pulses via wave packet interference.
The dissociation dynamics of Br2 molecules induced by two femtosecond pump pulses are studied based on the calculation of time-dependent quantum wave packet. Perpendicular transition from X 1Sigma g+ to A 3Pi 1u+ and 1Pi 1u+ and parallel transition from X 1Sigma g+ to B 3Pi 0u+, involving two product channels Br (2P3/2)+Br (2P3/2) and Br (2P3/2)+Br* (2P1/2), respectively, are taken into account. Two pump pulses create dissociating wave packets interfering with each other. By varying laser parameters, the interference of dissociating wave packets can be controlled, and the dissociation probabilities of Br2 molecules on the three excited states can be changed to different degrees. The branching ratio of Br*/(Br+Br*) is calculated as a function of pulse delay time and phase difference.
Han
Yong-Chang
YC
Department of Physics, Dalian University of Technology, Dalian 116024, People's Republic of China.
Yuan
Kai-Jun
KJ
Hu
Wen-Hui
WH
Yan
Tian-Min
TM
Cong
Shu-Lin
SL