物理学报2011，Vol.60Issue(5)：231-238,8.
碰撞阈值下氩原子非次序双电离
Nonsequential double ionization of argon atom below the recollision threshold
摘要
Abstract
Nonsequential double ionization (NSDI) of Ar atom below the recollision threshold is investigated using the threedimensional classical ensembles. The calculated results reveal a dominance of events for electron emission into opposite hemispheres, a clear minimum of the correlated electron-electron momentum distributions at the origin and a single peak structure of the Ar2+ ions longitudinal momentum spectra near zero momentum. The momentum spectra of the Ar2+ ions agree with the experimental results [ Phys. Rev. Lett. 101 053001 (2008) ] quantitatively. Trajectoryback analyses show that the microscopic physical mechanisms of Ar NSDI are distinct for different intensities of the laser. When laser intensity equal to 0. 7 × 1014 W/cm2 , one recollision dominates the process of the recollision. However, the domination convert to multiple recollisions as the laser intensity decreases to 0.4 × 1014 W/cm2. In addition, the Coulomb attraction between the ion and electron plays an important role in microscopic dynamics of the electron in the process of Ar NSDI and eventually influences the final-state correlated electron-electron momentum distributions strongly.关键词
非次序双电离/库仑引力/碰撞阈值/电子关联Key words
nonsequential double ionization/ Coulomb attraction/ recollision threshold/ electron correlation引用本文复制引用
张东玲,汤清彬,余本海,陈东..碰撞阈值下氩原子非次序双电离[J].物理学报,2011,60(5):231-238,8.基金项目
国家自然科学基金(批准号:11005088),河南省科技计划项目(批准号:082300410050,102300410241),河南省高等学校青年骨干教师资助计划项目,河南省教育厅自然科学研究计划项目(批准号:2009A140006)资助的课题. （批准号:11005088）
