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arXiv physics/0411096physics.atom-ph
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laser诱导的非顺序双电离中的束缚态修正

Bound-state corrections in laser-induced nonsequential double ionization

C. Figueira de Morisson Faria, M. Lewenstein

摘要:

我们进行了一个系统的分析,如何在激烈的,线性偏振激光场的非顺序双电离的影响,其中两个电子被绑定的初始状态,并通过剩余的离子势。我们假设第二个电子是通过第一个电子与其母离子的电子碰撞电离释放的,使用S-矩阵方法。我们在强场近似下工作,并使用鞍点方法计算微分电子动量分布。具体来说,我们认为电子在$1s$,$2p$,$3p$和本地化的状态,这是由接触或库仑型相互作用释放。我们还进行了充分的治疗的束缚态奇异性,这是目前在这个框架。我们表明,动量分布是非常敏感的空间扩展或本地化的波函数,但没有受到很大的影响,其形状。此外,为了克服束缚态奇异性进行的修改不显着改变的动量分布,除了在小动量的区域中的一个小的抑制。如果采用有效的形状因子,考虑到再散射时残留离子的存在,则仅发生根本性变化。如果离子势是接触型的,它超过了由长程电子-电子相互作用或空间扩展的束缚态引起的扩散。这导致动量分布表现出与现有的实验非常好的协议。

英文摘要:

We perform a systematic analysis of how nonsequential double ionization in intense, linearly polarized laser fields is influenced by the initial states in which both electrons are bound, and by the residual ionic potential. We assume that the second electron is released by electron-impact ionization of the first electron with its parent ion, using an S-Matrix approach. We work within the Strong-Field Approximation, and compute differential electron momentum distributions using saddle-point methods. Specifically, we consider electrons in $1s$, $2p$, $3p$ and localized states, which are released by either a contact or a Coulomb-type interaction. We also perform an adequate treatment of the bound-state singularity which is present in this framework. We show that the momentum distributions are very sensitive with respect to spatially extended or localized wave functions, but are not considerably influenced by their shape. Furthermore, the modifications performed in order to overcome the bound-state singularity do not significantly alter the momentum distributions, apart from a minor suppression in the region of small momenta. The only radical changes occur if one employs effective form factors, which take into account the presence of the residual ion upon rescattering. If the ionic potential is of contact type, it outweighs the spreading caused by a long-range electron-electron interaction, or by spatially extended bound states. This leads to momentum distributions which exhibit a very good agreement with the existing experiments.

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