强激光场中H^-离子二维光电子动量谱的理论研究  

Theoretical study of the two-dimensional momentum spectra of H^-ion in the intense laser fields

作　　者：孙长平[1] 崔宝凤[2] 

机构地区：[1]临沂大学理学院和凝聚态物理研究所,临沂276000 [2]临沂大学实验管理中心,临沂276000

出　　处：《原子与分子物理学报》2015年第1期108-114,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11247208;11064013);山东省自然基金(ZR2013AL008);临沂大学博士科研启动基金(LYDX2013BS057;LYDX2013BS018)

摘　　要：选用两个模型势,利用强场近似方法研究了H-离子在线性极化强激光场中二维光电子动量谱中次外层后重散射环.研究结果表明:两个模型势中的极化势对二维光电子动量谱的影响很小;随着激光强度的增加,二维光电子动量谱中出现后重散射环的数目变多,沿着次外层后重散射环的光电子的角分布波动性变小,能够通过多项式拟合的方法从二维光电子动量谱中次外层后重散射环获得精确的电子与H原子的弹性散射截面,特别适用于激光强度较小的情况.By using two model potentials chosen, the second outermost back rescattered ridges （BRR） of the two - dimensional （2D） momentum spectra of H - in the linear polarization laser fields are studied using the strong -field approximation （SFA） method. The results show that the polarization potentials in the two model poten- tials have little effect on the 2D momentum spectra, the number of BRR increases and the fluctuation of angular distributions along the second BRR decreases with the increase of the laser intensity, but the accurate electronatom elastic scattering cross sections can be retrieved directly along the second outermost BRR by the polynomial fitting method which is especially suitable for the case of the low laser intensity.

关 键 词：强场近似方法 含时薛定谔方程 动量谱 

分 类 号：O562[理学—原子与分子物理]