We report on a combined experimental and theoretical study of XUV ionization of atomic argon in the presence of a near-infrared (NIR) laser field. Using a table-top source of wavelength-selected femtosecond XUV pulses in combination with a velocity map imaging spectrometer we record angle- and energy-resolved photoelectron distributions and simulate the experimental data by solving the time-dependent Schrödinger equation ab initio . In order to compare with the experimental data we average the calculated energy-angle probability distributions over the experimental focal volume for different values of the magnetic quantum number of the photoelectron. This averaging procedure washes out the intracycle interference pattern, which would otherwise be observed in the form of angular modulations of the photoelectron spectra. We recover these modulations experimentally and in the simulations by evaluating the difference between two averaged distributions that are obtained for slig...

中文翻译：

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检索角度分辨的氩气激光辅助光发射中的周期内干扰

我们报告了在近红外（NIR）激光场存在下原子氩XUV电离的组合实验和理论研究。通过使用台式波长选择的飞秒XUV脉冲源和速度图成像光谱仪，我们记录了角度和能量分辨的光电子分布，并通过从头开始求解与时间有关的Schrödinger方程来模拟实验数据。为了与实验数据进行比较，我们针对光电子的磁性量子数的不同值，对实验焦点体积上计算出的能量角概率分布进行平均。该平均过程洗出了周期内干涉图，否则将以光电子光谱的角度调制的形式观察到。