泵浦-探测延时对三态阶梯型K_2分子的波包运动及态布居的影响  

Investigation on influence of pump-probe delay time on wave packet movement and population transfer of three-level ladder K_2 molecule

作　　者：冯小静[1] 白静[1] 郭玮[1] 

机构地区：[1]南华大学电气工程学院,湖南衡阳421001

出　　处：《中国科技论文》2015年第23期2769-2773,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(11447020);国家教育部留学回国人员科研启动基金资助项目(教外司留(2013)693号);湖南省自然科学基金资助项目(2015JJ3104)

摘　　要：利用三态模型和含时波包法,首次研究了三态阶梯型K2分子在强飞秒泵浦-探测激光场中延时对波包运动、光电子能谱及各态布居数的影响。研究表明:波包在激发态势能面上做周期性运动,运动周期大约为500fs;波包的周期性运动导致了光电子能谱谱峰位置的周期性变化;零延时光电子能谱呈现Autler-Townes(AT)双分裂,延时较大时光电子能谱为单峰无AT分裂;各态布居数,Rabi振荡强度及K2分子开始电离的时间随着延时的变化而不同。这些结果可以为实验中实现分子的光控制及量子操控过程提供一定参考。The effect of delay time on the wave packet movement, photoelectron spectra and population transfer of three-level lad- der K2 molecules by pump-probe pulses was investigated firstly via three-level model and time-dependent wave packet approach. Wave packet moves periodically on the excited state potential with vibration period of 500 fs. Periodic movements of wave packet result in the periodic variation of photoelectron spectra. The photoelectron spectra show Autler-Townes double splitting at zero delay, and no splitting at positive delay. The states population, Rabi oscillation and the original time for ionizing K2 molecules va- ry with the delay time. The results can provide some important basis for realizing the optical control and quantum manipulation of molecule experimentally.

关 键 词：光电子能谱 三态阶梯型K2分子 含时波包法 波包运动 布居数转移 

分 类 号：O561[理学—原子与分子物理]