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arXiv 0909.3409physics.atom-ph
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强场双电离机制的强度依赖性:从场助电离到场助电离

Intensity dependence of strong field double ionization mechanisms: from field-assisted recollision ionization to recollision-assisted field ionization

A. Emmanouilidou, A. Staudte

摘要:

使用三维准经典技术,我们探讨分子双电离的线偏振,红外(800 nm)和超短(6 fs)激光脉冲。我们首先专注于强度对应的隧道制度,并确定在此制度的主要电离机制。我们设计了一个选择的可观测量,如相关动量和动量的总和平行于激光场作为电子间逃逸角的函数,其中所有的主要机制有不同的痕迹。其次,我们解决了高于但接近越过屏障强度制度的强度。我们发现一个令人惊讶的反相关的电子动量类似的实验观察报告物理。\textbf{101},053001(2008)。然而,在那里,在对应于多光子制度的非常低的强度下观察到反相关。我们讨论了负责反平行的两个电子逃逸的机制。

英文摘要:

Using a three-dimensional quasiclassical technique we explore molecular double ionization by a linearly polarized, infrared (800 nm) and ultrashort (6 fs) laser pulse. We first focus on intensities corresponding to the tunneling regime and identify the main ionization mechanisms in this regime. We devise a selection of observables, such as, the correlated momenta and the sum of the momenta parallel to the laser field as a function of the inter-electronic angle of escape where all the main mechanisms have distinct traces. Secondly, we address intensities above but close to the over-the-barrier intensity regime. We find a surprising anti-correlation of electron momenta similar to the experimental observations reported in Phys. Rev. Lett. \textbf{101}, 053001 (2008). There, however, the anti-correlation was observed in very low intensities corresponding to the multiphoton regime. We discuss the mechanism responsible for the anti-parallel two-electron escape.

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