椭圆偏振光中库伦势对原子单电离的影响

Influence of Coulomb potential on atom single ionization in an elliptical polarized laser

采用三维半经典系综模型,研究椭圆偏振光中库伦势导致原子单电离出射角分布不对称的问题。模拟结果表明,库伦势主要影响了光电子在激光主极化方向的动量。在隧穿0.20倍的激光光学周期之后或者在离核40个原子单位以外不考虑库伦势,库伦势对光电子的出射角分布影响很小。这个结论对简化强激光场电离的模拟有着重要的指导意义。

Coulomb asymmetry of photoelectron angular distributions in strong elliptical laser fields is investigated by three-dimensional semi-classical model. It is found that the Coulomb potential mainly influences the momentum of photoelectron along major polarized direction of electric field in the simulation. Moreover,photoelectron angular distributions have hardly been influenced by Coulomb potential after 0. 20 times the laser optical cycle from tunneling or outranging 40 atomic units from the mother atomic nuclear. These results have a significance importance on simplifying simulation of intense laser field ionization.