周期量级激光脉冲驱动下非次序双电离的三维经典系综模拟  

Three-dimensional classical micro-canonical simulation of nonsequential double ionization with a few-cycle laser pulse

作　　者：汤清彬[1] 张东玲[1] 余本海[1] 陈东[1] 

机构地区：[1]信阳师范学院物理电子工程学院,信阳464000

出　　处：《物理学报》2010年第11期7775-7781,共7页Acta Physica Sinica

基　　金：河南省科技计划(批准号:082300410050;10230041005);河南省高等学校青年骨干教师资助计划;河南省教育厅自然科学研究计划(批准号:2009A140006)资助的课题~~

摘　　要：利用三维经典系综模型研究了周期量级激光脉冲驱动的氩原子非次序双电离,所得结果表明,Ar2+离子的纵向动量分布与载波包络相位有很强的依赖关系,随载波包络相位φ的增加,具有不对称双峰结构的离子纵向动量分布重心从负动量转移到正动量,并且φ每改变π时Ar2+离子的纵向动量呈现相反的分布.在重碰撞过程中核与电子之间的库仑势发生变化后,计算得到的Ar2+离子纵向动量分布随载波包络相位的变化与实验结果定量上一致.A three-dimensional classical micro-canonical model is used to investigate the ion momentum distributions of Ar atom in nonsequential double ionization with a few-cycle laser pulse.It is found that the momentum distribution has a strong dependence on the carrier-envelope phase of the few-cycle pulse.The centre of gravity of the asymmetry distribution shifts from negative to positive ion momenta with carrier-envelope phase increasing and it is reversed when the carrier-envelope phase changes by π.The momentum distributions of the Ar2 ＋ ion show excellent agreement with the experimental results when we take into account the change in Coulomb potential between the nucleus and electron in the recollision process.

关 键 词：非次序双电离 周期量级激光脉冲 载波包络相位 

分 类 号：O562.4[理学—原子与分子物理]