飞秒激光脉宽对非绝热耦合分子波包运动的影响研究  

Effect of femtosecond laser pulse width on wave packet motion of the nonadiabatic coupling molecule

作　　者：郭玮[1,2] 王怡 李月华[1] 路兴强[3] GUO Wei;WANG Yi;LI Yue-Hua;LU Xing-Qiang(School of Electric Engineering,University of South China,Hengyang 421001,China;State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Dalian 116023,China;School of Nuclear Science and Technology,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学电气工程学院,衡阳421001 [2]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023 [3]南华大学核科学技术学院,衡阳421001

出　　处：《原子与分子物理学报》2018年第3期455-460,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11704178);湖南省自然科学基金(2018JJ2312);湖南省教育厅基金(15B204);衡阳市科技局项目(2016KG75)

摘　　要：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.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 selective 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 experimentally.

关 键 词：分子物理学 波包运动 含时波包法 非绝热耦合NaI分子 态布居 激发概率 解离概率 

分 类 号：O561[理学—原子与分子物理]