平行电磁场中锂原子自电离的半经典分析

A semiclassical analyses on the auto-ionization of lithium atom in parallel electric and magnetic fields

采用包含组合回归的扩展的闭合轨道理论计算了平行电磁场中锂原子依赖于时间的自电离谱,并用半经典的方法解释了电离过程中的混沌现象.讨论了电离电子逃逸时间谱分形结构中隐含的各韵律段的电离轨迹,并得到了轨迹的一般规律,其中特别关注由核散射产生的特殊的逃逸轨迹的性质.具体研究了磁场对锂原子自电离混沌脉冲阵列中电子逃逸轨道和逃逸时间谱的影响.结果发现随着外加磁场的增大,电离脉冲越来越复杂,混沌现象也越明显.这显示了逃逸轨道对初始条件的敏感依赖性.

Based on the extended closed-orbit theory with the combination recurrence induced by the nuclear core scattering,we calculate the time-dependent auto-ionization rate of lithium atoms in parallel electric and magnetic fields, and the chaotic behavior in the auto-ionization process is explained. A qualitative description of the shape of the ionizing trajectories from the nesting distinct fractal epistrophes is given.In particular, some special escape trajectories induced by core-scattering is obtained in configuration space. The escape time and the auto-ionization rate that exhibit a series of chaotic pulse train are discussed for different magnetic fields. We find that, with the increase of the magnetic field, the ionizing electron pulse train along with the corresponding ionized electron trajectories become more and more complicated, showing the sensitive dependence of the dynamic properties on the initial conditions.