We present a theoretical study of atomic laser-assisted photoionization emission (LAPE). We consider an atom driven by a linearly polarized XUV laser in two different scenarios: i) a single attosecond pulse (in both the streaking and sideband regimes) and ii) an attosecond pulse train. The process takes place assisted by a linearly polarized infrared (IR) laser field. In all these cases the energy and angle-resolved photoelectron spectrum (PES) is determined by a leading contribution, related to the intracycle factor [Gramajo {et al.}, J. Phys. B 51 , 055603 (2018)], complemented by other ones, derived from the periodicity and symmetry properties of the dipole transition matrix with respect to the IR field. Each of these terms imprint particular features in the PES that can be straightforwardly understood in terms of generalized energy conservation laws. We investigate in detail these PES structures, in particular, for the case of argon initially in the 3s quantum state. Our theoretical scheme, based on the strong-field approximation (SFA), can be applied, however, to other atomic species and field configurations as well.

中文翻译：

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激光辅助光电离：条纹，边带和脉冲序列研究案例

我们提出了原子激光辅助光电离发射（LAPE）的理论研究。我们考虑了在两种不同情况下由线偏振XUV激光器驱动的原子：i）一个阿秒脉冲（在条纹和边带两种情况下）和ii）阿秒脉冲串。该过程在线性偏振红外（IR）激光场的辅助下进行。在所有这些情况下，能量和角度分辨光电子能谱（PES）由与周期内因子有关的主要贡献来确定[Gramajo {et al。}，J. Phys。B 51，055603（2018）]的补充，由偶极跃迁矩阵相对于IR场的周期性和对称性得出。这些术语中的每一个都在PES中留下了特殊的特征，这些特征可以从广义的节能法中直接理解。我们将详细研究这些PES结构，尤其是对于最初处于3s量子态的氩气的情况。我们基于强场近似（SFA）的理论方案也可以应用于其他原子种类和场构型。