Properties of Atoms in High External Fields (Physics)

这项拨款是为了支持量子系统的研究， 显示规则和不规则的经典轨迹与援助 各种各样的半经典方法，一些传统的，一些非常 最近开发的。 在第一年，注意力将集中在 强外场中的高激发态原子。 以低 能量和弱场，这些系统表现出准周期性 轨道，半经典能量和波函数可以是 通过量化动作变量来计算。 对于高 能量或强场，轨迹是混乱的， 不能使用熟悉的方法。 一种理论正在发展 这表明跃迁振幅的有序波动 与这些系统的闭合轨道有关。

This grant is to support studies of quantum systems that display regular and irregular classical trajectories with the aid of various semiclassical methods, some traditional and some very recently developed. In the first year, attention will be focused on highly excited atoms in strong external fields. At low energies and weak fields, these systems show quasiperiodic trajectories, and semiclassical energies and wavefunctions can be calculated by quantization of action variables. For high energies or strong fields, the trajectories are chaotic and familiar methods cannot be used. A theory is being developed that shows that orderly fluctuations in transition amplitudes are associated with closed orbits of such systems.