Coulomb focusing effect on the space distribution of the rescattering electron wavepacket in the laser–atom interaction
Coulomb focusing effect on the space distribution of the rescattering electron wavepacket in the laser–atom interaction
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DOI：
10.1088/0953-4075/42/16/165603
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
K. Sasaki;X. Tong;N. Toshima
中科院分区：
文献类型：
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作者：
K. Sasaki;X. Tong;N. Toshima
通过求解时间积分方程，研究了库仑聚焦效应对激光与原子相互作用中产生的再散射电子波包空间分布的影响。库仑聚焦在偶数返回中是明显的，因为那里的再散射电子能量较低。库仑力将再散射电子束聚焦到一个小空间中，再散射电子束电流强度可以达到1010 A cm−2的量级，比散射实验中使用的传统电子束强得多。库仑聚焦效应对第一次返回的影响较小，这解释了在H_2分子双电离实验中，释放动能谱在第三次返回时出现峰值的原因。
We investigated the Coulomb focusing effect on the space distribution of the rescattering electron wavepacket created in the laser–atom interaction solving the time integral equation. The Coulomb focusing is conspicuous in the even-number returns since the rescattering electron energies are lower there. The Coulomb force focuses the rescattering electron beam into a small space and the rescattering electron beam current intensity can reach the order of 1010 A cm−2, much more intense than the conventional electron beam used in scattering experiments. The Coulomb focusing effect plays a less important role for the first return and this explains why the released kinetic energy spectra have a peak at the third return in the experiments of the double ionization of H2 molecules.