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arXiv 0906.4229physics.atom-ph
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Laser诱导的非顺序双电离:双电离-激发-隧穿机制的运动学约束

Laser-induced nonsequential double ionization: kinematic constraints for the recollision-excitation-tunneling mechanism

T. Shaaran, C. Figueira de Morisson Faria

摘要:

我们研究的物理过程中,一个电子,在返回到它的母离子,促进第二个电子的激发态,它随后隧道。采用强场近似和鞍点方法,我们进行了详细的分析的动力学的两个电子,在量子轨道方面,并划定约束的动量分量平行于激光场的偏振。第一个电子的动能,在返回时,表现出略低于$10U_p$的截止,其中$U_p$是有质动力能,如在再散射阈值以上电离(ATI)中。第二个电子以类似ATI的直接过程离开激发态,其最大能量为$2U_p$。我们还计算了电子动量分布,其最大值与我们的估计和其他方法一致。

英文摘要:

We investigate the physical processes in which an electron, upon return to its parent ion, promotes a second electron to an excited state, from which it subsequently tunnels. Employing the strong-field approximation and saddle-point methods, we perform a detailed analysis of the dynamics of the two electrons, in terms of quantum orbits, and delimit constraints for their momentum components parallel to the laser-field polarization. The kinetic energy of the first electron, upon return, exhibits a cutoff slightly lower than $10U_p$, where $U_p$ is the ponderomotive energy, as in rescattered above-threshold ionization (ATI). The second electron leaves the excited state in a direct ATI-like process, with the maximal energy of $2U_p$. We also compute electron-momentum distributions, whose maxima agree with our estimates and with other methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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