摘要
以锂原子的光致漂移过程为例,从分析光致漂移的物理过程和锂原子的跃迁超精细吸收谱出发,结合分子动力学的输运方程和光与原子作用半经典近似下的密度矩阵,在光致漂移过程的动力学理论模型中同时引入了能级简并、超精细结构等因素,并以碰撞弛豫时间近似的方式将碰撞过程作为弛豫量引入微分方程组。在此基础上,在光致漂移过程中考虑了激光线宽的统计场处理方式,并成功推导了混沌场近似下的光致漂移过程中不同速度的锂原子在基态和激发态简并能级上布居分布的微分方程组。
According to physical process of light induced drift（LID） and hyperfine structure of lithium absorbing spectrum, the Boltzmann collision equation of gas diffusion and density matrix equation of semiclassical theory are combined to gain the dynamic simulation model of LID, in which, the delay time approximation and chaotic field model are used, and hyperfine structure and redistribution of excited state are taken into account. Using the statistic method of laser line width in LID, the differential equations of distribution on base and excited states of lithium atom with different velocities is proposed with chaotic field approximation.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第1期10-20,共11页
Acta Optica Sinica
关键词
原子与分子物理学
光致漂移
漂移速率
锂原子
混沌场
atomic and molecular physics
light induced drift
drift velocity
lithium atom
chaotic field
