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首页> 外文期刊>The Journal of Chemical Physics >Single-active-electron analysis of laser-polarization effects on atomic/molecular multiphoton excitation
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Single-active-electron analysis of laser-polarization effects on atomic/molecular multiphoton excitation

机译：激光极化效应的单敏 - 电子分析原子/分子多光子励磁

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We theoretically explore the effects of optical ellipticity on single-active-electron multiphoton excitation in atoms and (nearly) spherical molecules irradiated by intense polarized laser fields. This work was motivated by the experimental and theoretical studies of Hertel et al. [Phys. Rev. Lett. 102, 023003 (2009) and Phys. Rev. A 79, 053414 (2009)], who reported pronounced changes in the near-infrared-induced ion yields of xenon and C-60 as a function of ellipticity (in particular, yield reduction for circular polarization) at low light intensities and derived a perturbative cross section formula to describe such polarization effects by assuming that the excited-state energies and radial transition electric dipole moments of the system are independent of the azimuthal quantum number l. First, by reformulating the N-photon absorption cross section of a single active electron, we prove that their assumptions reduce the network of optically allowed transition pathways into what we call the "Pascal triangle" consisting of (N + 1) (N + 2)/2 states only. Next, nonperturbative analytical and numerical solutions of the time-dependent Schrodinger equation for a simple model of two-photon excitation are presented not only in the low-intensity regime but also in the high-intensity regime. The results show that the determining factor of ellipticity-dependent multiphoton excitation probability is transition moment magnitudes and that the detailed energetic structure of the system also becomes important at high intensities. The experimentally observed flattening of the ion yields of xenon and C-60 with increasing intensity can be explained without a saturation effect, which was previously deemed to be responsible for it. We also argue the applicability range of the cross section formula by Hertel et al. and the identity of the "doorway state" for ionization of C-60. Published by AIP Publishing.
机译：理论上，我们探讨了光学椭圆性对由强度偏振激光田的原子和（几乎）球形分子中的单活性电子多光激发的影响。这项工作是由Hertel等人的实验和理论研究的推动。 [物理。 rev. lett。 102,023003（2009）和phy。 Rev. A 79,053414（2009）]，其报告了近红外诱导的氙和C-60的近红外诱导的离子产率的显着变化，作为椭圆形（特别是圆极化的圆极化的产量降低）和通过假设系统的激发状态能和径向转换电偶极偶像与方位角量子数L无关，通过假设扰动横截面公式来描述这种偏振效应。首先，通过重新重整单个活性电子的N-光子吸收横截面，我们证明了它们的假设将光学允许的过渡途径的网络降低到我们称之为（n + 1）（n + 2）组成的“帕斯卡三角”（n + 2） / 2个州。接下来，不仅在低强度制度中呈现了用于简单模型的时间依赖性Schrodinger方程的非触发分析和数值解，而且在高强度方案中呈现。结果表明，依赖性依赖性多光子激发概率的确定因子是转换力矩幅度，并且系统的详细能量结构在高强度也很重要。可以在没有饱和效应的情况下解释具有增加的强度的氙和C-60的离子产量的实验观察到的扁平化，其先前被认为是对其负责的。我们还通过Hertel等人争辩横截面公式的适用范围。以及用于电离C-60的“门口状态”的身份。通过AIP发布发布。

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