椭圆偏振强激光场中Mg原子的非次序双电离  

Non-Sequential Double Ionization of Magnesium Atom in Elliptically Polarized Strong Laser Field

作　　者：郑晓晓[1] 白丽华[1] 冯凤珍[1] 

机构地区：[1]上海大学理学院,上海200444

出　　处：《激光与光电子学进展》2017年第8期59-65,共7页Laser & Optoelectronics Progress

摘　　要：采用经典系综模型研究了椭圆偏振强激光场中Mg原子的非次序双电离。Mg原子在椭圆偏振强激光场中存在非次序双电离,且非次序双电离的电离率随着椭圆率的增大而降低,但降低的幅度不大。通过轨迹回溯分析可以发现,随着椭圆率增大,返回重碰撞电子数量的减少使得Mg原子非次序双电离的电离率降低。另外,两电子横向相关动量分布及不同能量的电子数量分布表明,返回电子的能量随着激光场椭圆率的增大而增大,使得第2个电子在返回电子的少次甚至一次重碰撞下即可电离,这在一定程度上补偿了降低的电离率,从而使电离率降低得不明显。The non-sequential double ionization of magnesium atom in elliptically polarized strong laser field is investigated with the classical ensemble method. The non-sequential double ionization occurs in elliptically polarized strong laser field for magnesium atom, and the ionization rate decreases a little with the increase of ellipticity. Back analysis of the non-sequential double ionization trajectories shows that the decrease of the number of returning electrons results in the decrease of ionization rate. In addition, the distributions of the correlated two-electron transverse momentum and counts of electron with different energies demonstrate the kinetic energy of ionized electrons rises with the increase of ellipticity, so the second electron can be ionized easily with the reeollision of the returning electron, which can compensate the reduced ionization rate, and thus the ionization rate does not decrease too much.

关 键 词：原子与分子物理学 非次序双电离 椭圆偏振激光场 重碰撞 

分 类 号：O562.3[理学—原子与分子物理] O562.4[理学—物理]