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Ionization and excitation of the excited hydrogen atom in strong circularly polarized laser fields

机译:强圆偏振激光场中激发氢原子的电离和激发

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In the recent work of Herath et al. [T. Herath, L. Yan, S. K. Lee, and W. Li, Phys. Rev. Lett. 109, 043004 (2012)] the first experimental observation of a dependence of strong-field ionization rate on the sign of the magnetic quantum number m [of the initial bound state (n,l,m)] was reported. The experiment with nearly circularly polarized light could not distinguish which sign of m favors faster ionization. We perform ab initio calculations for the hydrogen atom initially in one of the four bound substates with the principal quantum number n = 2, and irradiated by a short circularly polarized laser pulse of 800 nm. In the intensity range of 10(12) - 10(13) W/cm(2) excited bound states play a very important role, but also up to some 10(15) W/cm(2) they cannot be neglected in a full description of the laser-atom interaction. We explore the region that with increasing intensity switches from multiphoton to over-the-barrier ionization and we find, unlike in tunneling-type theories, that the ratio of ionization rates for electrons initially counter-rotating and corotating (with respect to the laser field) may be higher or lower than 1.
机译:在Herath等人的最新著作中。 [T. Herath Yan L,S。K. Lee和W. Li,物理。牧师109,043004(2012)]报道了关于强场电离速率对磁量子数m [初始束缚态(n,l,m)]的符号的依赖性的首次实验观察。用近圆偏振光进行的实验无法区分m的哪个符号有利于更快的电离。我们首先从四个量子主键数n = 2的键合子状态之一中进行氢原子的从头算,然后由800 nm的短圆偏振激光脉冲照射。在10(12)-10(13)W / cm(2)的强度范围内,激发的束缚态起着非常重要的作用,但在高达10(15)W / cm(2)的范围内,它们也不能忽略激光-原子相互作用的完整描述。我们探索了随着强度的增加而从多光子电离切换到跨壁电离的区域,并且发现与隧道型理论不同,电子的电离速率比率最初会反向旋转和同向旋转(相对于激光场) )可以高于或低于1。

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