RUI: Classical and Quantum Studies of Non-Sequential Multiple Ionization of Atoms in Strong Laser Fields

该项目涉及强激光对原子双电离的计算机模拟。拟议的工作主要基于经典力学，而不是量子力学。它使用了一个由40万个经典双电子原子组成的系综，每个原子的初始条件略有不同，尽管它们的总能量(等于实际氦基态的能量)和零角动量都相同。每个经典原子都通过强红外激光脉冲在时间上演化，并分析了它们的终态。然后，对表现出所需最终特性的原子进行回溯，以了解它们的历史。其目的是加深对双电离过程，特别是再碰撞过程的动力学的了解，在这个过程中，一个电子被电离，但由于振荡的激光场返回到正离子，并与另一个电子重新碰撞。

The project involves computer modeling of double ionization of atoms by intense laser light. The proposed work is based primarily on classical mechanics rather than quantum mechanics. It uses an ensemble of 400,000 classical two-electron atoms, each of which is given slightly different initial conditions, although they all have the same total energy (equal to the energy of the actual helium ground state) and zero angular momentum. Each classical atom is evolved in time through an intense infrared laser pulse, and the final states are analyzed. Atoms that demonstrate desired final characteristics are then backtracked to learn their history. The objective is to obtain increased understanding of the dynamics of the double ionization process, and especially of recollision, which is a process in which one electron is ionized but because of the oscillating laser field returns to the positive ion and recollides with the other electron.