计算物理 ›› 2017, Vol. 34 ›› Issue (1): 119-125.

• 研究论文 • 上一篇    

飞秒激光参数对非绝热耦合分子态布居的影响

郭玮, 白静, 李月华   

  1. 南华大学电气工程学院, 湖南 衡阳 421001
  • 收稿日期:2015-11-04 修回日期:2016-02-24 出版日期:2017-01-25 发布日期:2017-01-25
  • 通讯作者: 李月华,E-mail:bhylyh.com@163.com
  • 作者简介:郭玮(1981-),女,博士(后),副教授,从事强激光与物质相互作用研究,E-mail:vella99@163.com
  • 基金资助:
    国家自然科学基金(11447020)和湖南省自然科学基金(2015JJ3104)资助项目

Effect of Femtosecond Laser Parameters on State Populations of Nonadiabatic Coupling Molecules

GUO Wei, BAI Jing, LI Yuehua   

  1. School of Electrical Engineering, University of South China, Hengyang 421001, China
  • Received:2015-11-04 Revised:2016-02-24 Online:2017-01-25 Published:2017-01-25

摘要: 利用含时波包法研究强飞秒泵浦-探测激光场中激光脉宽、波长和场强对非绝热耦合NaI分子各态布居的影响.波包在势能面上做周期性运动,周期约为1 000 fs.延时为200 fs时,波包第一次到达交叉区域分裂成两部分.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.泵浦波长为共振波长318 nm时,激发概率最大.泵浦波长增长,NaI分子的解离概率减小.泵浦场强增大,激发概率增大,但解离概率不变.探测激光波长和场强不影响NaI分子各态布居分布.调节激光场参数可实现对波包运动的控制从而控制态布居的选择性分布.研究结果为实验上实现分子的光控制过程提供参考.

关键词: 强飞秒泵浦-探测激光, 非绝热耦合NaI分子, 含时波包法, 态布居

Abstract: Influence of pulse width, laser wavelength and laser intensity on state populations of a NaI molecule driven by a pump-probe pulse was studied via time-dependent wave packet approach.Wave packet moves periodically with roundtrip time 1 000 fs.Wave packet bifurcates in crossing region firstly at delay time 200 fs, which affects state populations.Excitation probability increases and dissociation probability decreases with increasing pulse width.Excitation probability approaches the maximum at resonance pump wavelength 318 nm.Dissociation probability decreases with increasing pump wavelength.As pump intensity increases, excitation probability increases while dissociation probability does not change.Probe wavelength and probe intensity do not affect state populations.Wave packet motion and selective distribution of state populations can be achieved by adjusting laser parameters.It provides bases for realizing light manipulation of molecules experimentally.

Key words: intense femtosecond pump-probe pulse, nonadiabatic coupling NaI molecule, time-dependent wave packet approach, state populations

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