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arXiv 1502.05917quant-phphysics.atom-ph
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强场隧道电离的电离时间和出射动量

Ionization Time and Exit Momentum in Strong-Field Tunnel Ionization

Nicolas Teeny, Enderalp Yakaboylu, Heiko Bauke, Christoph H. Keitel

摘要:

隧道电离属于原子物理学的基本过程。所谓的两步模型,它描述了电离的瞬时隧道在电场最大值和经典运动之后与零出口动量,通常被用来描述隧道电离在绝热制度。在这篇文章中,我们通过数值求解一维的含时薛定谔方程,并在隧道出口处采用虚拟探测器,表明在电场最大值和电离时刻之间存在非零的正时延。此外,我们还发现在电场的方向上有一个非零的出口动量。为了从电离电子的渐近动量分布中提取适当的隧穿时间,必须将电子在外部电场方向上的初始动量合并。

英文摘要:

Tunnel ionization belongs to the fundamental processes of atomic physics. The so-called two-step model, which describes the ionization as instantaneous tunneling at the electric field maximum and classical motion afterwards with zero exit momentum, is commonly employed to describe tunnel ionization in adiabatic regimes. In this contribution, we show by solving numerically the time-dependent Schrödinger equation in one dimension and employing a virtual detector at the tunnel exit that there is a nonvanishing positive time delay between the electric field maximum and the instant of ionization. Moreover, we find a nonzero exit momentum in the direction of the electric field. To extract proper tunneling times from asymptotic momentum distributions of ionized electrons, it is essential to incorporate the electron's initial momentum in the direction of the external electric field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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