两态模型中的振动态布居转移  

The vibrational population transfer in two-state model

作　　者：胡晋伟 雷永清 张华 HU Jin-Wei;LEI Yong-Qing;ZHANG Hua(Shanxi Vocational University of Engineering and Technology,Taiyuan 030000,China;Department of Physics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]山西工程科技职业大学,太原030000 [2]大连理工大学物理学院,大连116024

出　　处：《原子与分子物理学报》2024年第6期103-108,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(12174044)。

摘　　要：以氢化锂极性双原子分子为例,运用含时量子波包法数值求解两态模型,从理论方面研究了基电子态X^(1)Σ^(+)通过跃迁偶极矩到激发电子态A^(1)Σ^(+),两态模型中的振动态布居转移过程.基电子态上以及激发电子态上各自的振动态通过激光脉冲与永久偶极矩作用完成布居转移过程也考虑在内.在紫外光和红外光区域内,使用短的线性偏振激光脉冲实现了高效的布居转移.经过选择激光脉冲的峰值强度、中心频率以及持续时间等参数,在激光脉冲关闭后,最终的布居转移几率都超过了90%.Taking LiH polar diatomic molecule for instance, the dynamical process of population transfer in the two-state model, from the ground electronic state X^(1)Σ^(+) to the excited electronic state A^(1)Σ^(+) through transition dipole moment, is studied theoretically. The time-dependent quantum wavepacket method is used to solve two coupled Schr dinger equation numerically. The population transfers of ground and excited electronic states through the interaction of laser pulse and molecular permanent dipole moments are also considered. These population transfer processes are realized using short linearly polarized laser pulses in the ultraviolet (UV ) and infrared (IR ) regions. By selecting the peak intensity, central frequency, duration of laser pulses, etc, the final population transfer probability is more than 90% after the laser pulse is turned off.

关 键 词：布居转移 两态模型 含时量子波包 

分 类 号：O562.4[理学—原子与分子物理]