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arXiv physics/0312052physics.atom-ph
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laser诱导非顺序双电离的电子-电子动力学

Electron-electron dynamics in laser-induced nonsequential double ionization

C. Figueira de Morisson Faria, X. Liu, H. Schomerus, W. Becker

摘要:

为了描述强线偏振激光场作用下稀有气体原子的非顺序双电离(NSDI),在强场近似下计算了包含再散射碰撞电离的量子力学$S$矩阵图.我们采用一致逼近,这是一个推广的标准鞍点逼近。我们系统地分析了电子-电子相互作用在射出电子的动量分布中的表现形式:对于返回电子释放束缚电子的相互作用,我们采用(三体)接触相互作用或库仑相互作用,并考虑或不考虑两个电子在其终态的相互库仑排斥。特别是,我们调查的相关性的动量分量平行于激光场的偏振,与横向动量分量限制在一定的有限范围内或完全总结。在后一种情况下,与实验数据的协议是最好的接触相互作用,没有最终状态排斥。在前一种情况下,如果横动量被限制在很小的值,理论与数据的比较表明库仑效应的证据。我们建议,实验数据选择事件与小横动量的\textit{both}电子是特别有前途的NSDI的动力学的阐明。此外,一个经典的量子力学$S$矩阵的近似公式,并示出工作非常好的经典允许区域内。

英文摘要:

For the description of nonsequential double ionization (NSDI) of rare-gas atoms by a strong linearly polarized laser field, the quantum-mechanical $S$-matrix diagram that incorporates rescattering impact ionization is evaluated in the strong-field approximation. We employ a uniform approximation, which is a generalization of the standard saddle-point approximation. We systematically analyze the manifestations of the electron-electron interaction in the momentum distributions of the ejected electrons: for the interaction, by which the returning electron frees the bound electron, we adopt either a (three-body) contact interaction or a Coulomb interaction, and we do or do not incorporate the mutual Coulomb repulsion of the two electrons in their final state. In particular, we investigate the correlation of the momentum components parallel to the laser-field polarization, with the transverse momentum components either restricted to certain finite ranges or entirely summed over. In the latter case, agreement with experimental data is best for the contact interaction and without final-state repulsion. In the former, if the transverse momenta are restricted to small values, comparison of theory with the data shows evidence of Coulomb effects. We propose that experimental data selecting events with small transverse momenta of \textit{both} electrons are particularly promising in the elucidation of the dynamics of NSDI. Also, a classical approximation of the quantum-mechanical $S$ matrix is formulated and shown to work very well inside the classically allowed region.

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