K_2分子在强激光场下的量子调控:缀饰态选择性分布  

Quantum control of K_2 molecule in an intense laser field:Selective population of dressed states

作　　者：姚洪斌[1] 李文亮[1] 张季[1] 彭敏[1] 

机构地区：[1]新疆工程学院基础教学研究部,乌鲁木齐830091

出　　处：《物理学报》2014年第17期351-357,共7页Acta Physica Sinica

基　　金：新疆维吾尔自治区高等学校科研计划项目(批准号:XJEDU2012S41);新疆维吾尔自治区青年科技创新人才培养工程(批准号:2013731008)资助的课题~~

摘　　要：利用含时量子波包法理论研究了分子在强激光场条件下的量子调控.选取K2分子的三态模型(基态|X〉、激发态|B〉和电离态|X+〉)作为研究对象.在强激光场的作用下,激发态|B〉缀饰成两个子态:|α〉态和|β〉态.分析K2分子电离后的光电子能谱,可以得到缀饰态|α〉和|β〉的能量和概率分布信息.同时,根据分子的缀饰态理论,提出了K2分子的缀饰态选择性分布方案.研究表明:调节激光场的强度可以实现对缀饰态能量的调控,改变激光场的波长可以实现对缀饰态概率的选择性分布.Control of molecular dynamics in an intense laser field has been studied by employing the time-dependent wave packet approach. A system of K2 molecule in three states （ground state ｜X）, excited state ｜B） and ionized state｜X＋）） serves as a prototype which interacts with pump-probe laser fields. Interacting with an intense pump field, the excited state ｜β）splits into two substates： a）and ｜β）. Information of the energies and probability distributions of dresses states la/ and ｜β〉 can be obtained by analysing the photoelectron spectra （PES） of K2 molecule. Meanwhile, the scheme of selective population of dressed states （SPODS） has been put forward according to the dressed states theory of K2 molecule. It is found that regulating the laser intensity can control the dressed state energies, and altering the laser wavelength can make the high selectivity of the dressed state population readied.

关 键 词：量子调控 含时波包法 缀饰态 光电子能谱 

分 类 号：O431.2[机械工程—光学工程]