Intensity dependence of strong-field double-ionization mechanisms: From field-assisted recollision ionization to recollision-assisted field ionization
Intensity dependence of strong-field double-ionization mechanisms: From field-assisted recollision ionization to recollision-assisted field ionization
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DOI：
10.1103/physreva.80.053415
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发表时间：
2009-11-01
影响因子：
2.9
通讯作者：
Staudte, A.
中科院分区：
文献类型：
--
作者：
Emmanouilidou, A.;Staudte, A.
利用三维准经典技术，我们探索了线性偏振、红外（800 nm）和超短（6 fs）激光脉冲的分子双电离。我们首先关注与隧穿状态相对应的强度，并确定该状态下的主要电离机制。我们设计了一系列可观测值，如相关动量和平行于激光场的动量之和作为电子间逸出角的函数，其中所有主要机制都有明显的痕迹。其次，我们解决上述强度，但接近过障强度制度。我们发现了电子动量惊人的反相关，类似于在《物理学》上报道的实验观察。然而，在与多光子体制相对应的非常低的强度下，反相关被观察到。我们讨论了反平行双电子逸出的机制。
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 interelectronic angle of escape, where all the main mechanisms have distinct traces. Second, we address intensities above but close to the over-the-barrier intensity regime. We find a surprising anticorrelation of electron momenta similar to the experimental observations reported in Phys. Rev. Lett. 101, 053001 (2008) There, however, the anticorrelation was observed in very low intensities corresponding to the multiphoton regime. We discuss the mechanism responsible for the antiparallel two-electron escape.