Semiclassical theory of molecular nonsequential double ionization
Semiclassical theory of molecular nonsequential double ionization
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DOI：
10.1103/physreva.76.013418
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发表时间：
2007-07-01
影响因子：
2.9
通讯作者：
Yang, S. P.
中科院分区：
文献类型：
--
作者：
Chen, J.;Fan, J.;Yang, S. P.
在再散射模型的基础上发展了一个半经典分子非顺序双电离理论。结果表明，在D-2的非序列双电离过程中，返回电子的动能随着激光波长的变化而从低于母离子电离阈值变为高于母离子电离阈值，从而导致在较短激光波长下以碰撞电离为主，在较长激光波长下以场电离为主.我们还计算了D-2的双电离时间分布和D+的动能分布。理论结果与实验测量定性一致。计算了N-2（2+）/N-2（+）的非顺序双单电离比，并与已有的实验结果进行了比较。
A semiclassical molecular nonsequential double ionization theory is developed based on the rescattering model. We show that, in the nonsequential double ionization of D-2, the kinetic energy of the returning electron changes from below to above the ionization threshold of the parent ion as the laser varies from short to long wavelength, resulting in the dominance of collisional ionization at shorter laser wavelength and field ionization at longer laser wavelength. We also calculate the double ionization time distribution of D-2 and the kinetic energy distribution of D+. The theoretical results are qualitatively consistent with experimental measurements. The nonsequential double to single ionization ratio of N-2(2+)/N-2(+) is also calculated and compared with available experimental results.