Non-sequential double ionization of Mg atoms in elliptically polarized laser fields
Non-sequential double ionization of Mg atoms in elliptically polarized laser fields
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DOI：
10.1088/1054-660x/23/5/055303
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发表时间：
2013-04
期刊：
影响因子：
1.2
通讯作者：
Jing Guo;Tian Wang;Xue-shen Liu;Jia-Zhong Sun
中科院分区：
文献类型：
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作者：
Jing Guo;Tian Wang;Xue-shen Liu;Jia-Zhong Sun
研究了椭圆偏振激光场中Mg原子的非序贯双电离。数值结果表明，在我们所考虑的激光强度范围内（1013-1015 W cm−2），随着椭圆率的增加，“膝”结构更加明显，在椭圆率较高时更容易发生碰撞激发和随后的隧穿电离，这可以用相应的电子动量分布很好地解释.此外，脉冲结束时Mg原子的电离电子能量也表明，在椭圆偏振激光场中仍然会发生电子的再散射。此外，还计算了电离电子的角分布，结果表明，在椭圆偏振激光场中，电子的角分布不再是沿着x轴分布。
The non-sequential double ionization of the Mg atom in elliptically polarized laser fields is investigated. The numerical results indicate that the ‘knee’ structure is more obvious with increasing ellipticity in the laser intensity range (1013–1015 W cm−2) we considered, and recollision excitation with subsequent tunnelling ionization occurs much more easily at higher ellipticity, which can be well explained by the corresponding momentum distribution of electrons. Moreover, the ionized electron energy of Mg atoms at the end of the pulse also indicates that rescattering of electrons still occurs in elliptically polarized laser fields. In addition, the angular distribution of ionized electrons is also calculated and the result shows that angular distribution of electrons is no longer along the x-axis in elliptically polarized laser fields.