飞秒激光脉宽对非绝热耦合分子波包运动的影响研究

摘要

The dependence of the wave packet process of NaI molecule on pulse width was studied via the time－dependent wave packet approach.It is found that with the increase of pulse width,the oscillation period of wave packet increases,while oscillation amplitude decreases.The wave packet bifurcation induced by the nonadiabatic effect in the crossing region affects state populations.It is found that with the increase of pump wavelength,the dissociation probability decreases,while the excitation probability increases.The wave packet motion and selec-tive distribution of state populations,excitation and dissociation of molecule can be achieved by adjusting laser pulse width.The results can provide some important basis for realizing quantum manipulation of molecules exper-imentally.%利用含时波包法研究了强飞秒泵浦－探测激光场中激光脉宽对非绝热耦合NaI分子波包运动的影响.发现波包的振荡周期随脉宽增长而增大,而振荡幅度随脉宽增长而减小.非绝热效应引起的波包在交叉区域的分裂情况影响各态布居.脉宽增长,NaI分子的激发概率增大,而解离概率减小.研究表明调节激光场脉宽可实现对波包运动的控制从而控制态布居的选择性分布.研究结果可以为实验上实现分子的光控制以及量子调控过程提供一定的参考.