Classical study of atomic bound state dynamics in circularly polarized ultrastrong fields
Classical study of atomic bound state dynamics in circularly polarized ultrastrong fields
复制标题
圆偏振超强场中原子束缚态动力学的经典研究
DOI：
10.1088/0953-4075/47/13/135601
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
B. Walker
中科院分区：
文献类型：
--
作者：
S. Luo;P. Grugan;B. Walker
我们研究了高达 1000 au (3 × 1022 W cm−2) 的超强场中的类氢原子。我们发现外部超强场的磁性分量（冲击波）的影响对原子的束缚态引入了扰动。对于高达 1 × 1019 W cm−2 的强度，轨迹能量和庞加莱图的变化约为百分之几。 Blaser 与圆偏振 (CP) 光的变化虽然很小，但可能会导致束缚态最高强度下的电离概率降低数倍，其中电离接近 50%。对于这些最高强度，我们发现来自 Blaser 的洛伦兹力对垂直于 CP 光旋转平面的束缚电子施加力。由于这些轨迹随后远离势垒的最小值排列，因此它可以稳定地抵抗隧道电离。结果提供了对超强场电离的经典理解，并表明超强场电离中的相对论效应最容易在 CP 场中看到。
We investigate hydrogen-like atoms in ultrastrong fields up to 1000 au (3 × 1022 W cm−2). We find the influence of the magnetic component (Blaser) of the external ultrastrong field introduces perturbations for the bound states of the atom. For intensities up to 1 × 1019 W cm−2 the changes in the trajectory energies and Poincaré plots are on the order of a few per cent. While small, the changes from Blaser with circular polarized (CP) light can result in a several-fold decrease in the ionization probability at the highest intensities for the bound states, where ionization approaches 50%. For these highest intensities, we find the Lorentz force from Blaser exerts a force on the bound electron perpendicular to the rotating plane of the CP light. Since these trajectories are then aligned away from the minimum in the potential barrier it is stabilized against tunnelling ionization. The results provide a classical understanding for ionization in ultrastrong fields and indicate that relativistic effects in ultrastrong field ionization may most easily be seen with CP fields.