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arXiv 1111.3555physics.atom-phphysics.optics
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强场过程中的电子关联和干涉效应

Electron correlation and interference effects in strong-field processes

Markus C. Kohler, Carsten Müller, Christian Buth, Alexander B. Voitkiv, Karen Z. Hatsagortsyan, Joachim Ullrich, Thomas Pfeifer, Christoph H. Keitel

备注：
to be published in Springer Proceedings "Multiphoton Processes and Attosecond Physics"
发表信息：
Multiphoton Processes and Attosecond Physics, Series: Springer Proceedings in Physics, Volume 125, edited by Kaoru Yamanouchi and Katsumi Midorikawa (Springer, Berlin, Heidelberg, 2012), pages 209-217, ISBN: 978-3-642-28947-7
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摘要：

研究了强场物理中的几种关联效应和干涉效应。我们发现，连续波包的干涉可以是高次谐波产生（HHG）的主要机制在越垒制度。接下来，我们结合高次谐波与共振X射线激发，以迫使重新结合的连续体电子的核心孔，而不是价孔，它以前是隧道电离。该方案为非线性xuv物理，阿秒x射线脉冲和核心轨道光谱学开辟了前景。在此基础上，提出了一种通过设计合适的电子波包来产生无阿啁啾谐波脉冲的方法。最后，讨论了在纳米尺度下，双原子共振光电离机制优于单原子直接电离机制。

英文摘要：

Several correlation and interference effects in strong-field physics are investigated. We show that the interference of continuum wave packets can be the dominant mechanism of high-harmonic generation (HHG) in the over-the-barrier regime. Next, we combine HHG with resonant x-ray excitation to force the recolliding continuum electron to recombine with a core hole rather than the valence hole from that it was previously tunnel ionized. The scheme opens up perspectives for nonlinear xuv physics, attosecond x-ray pulses, and spectroscopy of core orbitals. Then, a method is proposed to generate attochirp-free harmonic pulses by engineering the appropriate electron wave packet. Finally, resonant photoionization mechanisms involving two atoms are discussed which can dominate over the direct single-atom ionization channel at interatomic distances in the nanometer range.

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