论文标题
非线性Cooper Minima附近非共振两光原子电离的光电子角分布
Photoelectron Angular Distributions of Nonresonant Two-Photon Atomic Ionization Near Nonlinear Cooper Minima
论文作者
论文摘要
理论上研究了中性原子两光子电离的光电角分布。在独立粒子近似和相对论二阶扰动理论中进行了两光子电离横截面和不对称参数的数值计算。研究了不对称参数对入射光的极化和能量以及电离电子的角动量特性的依赖性。虽然预计在中等水平共振附近的光子能量的角度分布的动态变化，但我们证明了同样强的变化发生在非线性库珀最小值附近。描述的现象在镁原子的两光子电离的示例中得到了证明。
Photoelectron angular distributions of the two-photon ionization of neutral atoms are theoretically investigated. Numerical calculations of two-photon ionization cross sections and asymmetry parameters are carried out within the independent-particle approximation and relativistic second-order perturbation theory. The dependence of the asymmetry parameters on the polarization and energy of the incident light as well as on the angular momentum properties of the ionized electron are investigated. While dynamic variations of the angular distributions at photon energies near intermediate level resonances are expected, we demonstrate that equally strong variations occur near the nonlinear Cooper minimum. The described phenomena is demonstrated on the example of two-photon ionization of magnesium atom.
