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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photoelectron Angular Distributions and Cross Section Ratios of Two-Color Two-Photon Above Threshold Ionization of Argon
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Photoelectron Angular Distributions and Cross Section Ratios of Two-Color Two-Photon Above Threshold Ionization of Argon

机译：阈值以上电离的双色双色双色光子的电子角度分布和截面比

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摘要

Anisotropy parameters and cross section ratios of two-color two-photon above threshold ionization sidebands from argon are measured using photoelectron velocity map imaging with the selected 13th or 15th high-order harmonics in a perturbative 800 nm dressing field. A new data analysis technique determines accurate anisotropy parameters of the photoelectron angular distributions for each sideband by subtracting a sequence of percentages of the single-photon ionization background from the above threshold ionization signal to correct for the angular averaging of overlapping photoelectron energies. The results provide a fundamental test of theoretical predictions based on second-order perturbation theory with a one-electron model and the soft-photon approximation and show agreement with theory for the cross section ratios. However, discrepancies between the theoretically predicted and experimentally determined photoelectron angular distributions demonstrate the need for a more comprehensive theoretical description of two-color two-photon above threshold ionization.
机译：使用光电子速度图成像，在扰动的800 nm修整场中，使用选定的第13个或第15个高次谐波，测量高于阈值电离氩的双色双光子带的各向异性参数和截面比。一种新的数据分析技术通过从上述阈值电离信号中减去一系列单光子电离背景的百分比序列来校正重叠光电子能的角度平均，从而确定每个边带的光电子角度分布的准确各向异性参数。结果为基于二阶微扰理论，单电子模型和软光子近似的理论预测提供了基础测试，并且与截面比理论相符。但是，理论上预测的和实验确定的光电子角分布之间的差异表明，需要对阈值电离以上的双色双光子进行更全面的理论描述。

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