Role of tunnel ionization in high harmonic generation from substituted benzenes.
Role of tunnel ionization in high harmonic generation from substituted benzenes.
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DOI：
10.1039/c6fd00116e
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发表时间：
2016-12
影响因子：
3.4
通讯作者：
D. Austin;F. McGrath;L. Miseikis;D. Wood;P. Hawkins;Allan S. Johnson;M. Vacher;Z. Mašín;A. Harvey;M. Ivanov;O. Smirnova;J. Marangos
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文献类型：
--
作者：
D. Austin;F. McGrath;L. Miseikis;D. Wood;P. Hawkins;Allan S. Johnson;M. Vacher;Z. Mašín;A. Harvey;M. Ivanov;O. Smirnova;J. Marangos
本文从理论上研究了1.8 μm超短脉冲驱动下甲苯、邻二甲苯和氟苯的高次谐波产生。我们发现，化学取代有很强的影响的振幅和相位的发射从最高占据的分子轨道，尽管有一个小的影响轨道本身。我们表明，这种影响是由于隧道电离步骤，这取决于关键的符号和振幅的波函数的渐近部分。我们将讨论如何在相位敏感的高次谐波发生光谱实验中表现出这些影响。
We theoretically study high-harmonic generation in toluene, ortho-xylene and fluorobenzene driven by a 1.8 μm ultrashort pulse. We find that the chemical substitutions have a strong influence on the amplitude and phase of the emission from the highest occupied molecular orbital, despite having a small influence on the orbital itself. We show that this influence is due to the tunnel ionization step, which depends critically on the sign and amplitude of the asymptotic part of the wave function. We discuss how these effects would manifest in phase-sensitive high-harmonic generation spectroscopy experiments.