非对称共面散射几何下快电子-氢原子碰撞的激光辅助（e,2e）过程中的缀饰效应
Dressing effects in laser-assisted ($e,2e$) process in fast electron-hydrogen atom collisions in an asymmetric coplanar scattering geometry
AI总结：
该研究针对氢原子快电子激光辅助（e,2e）电离碰撞，构建半微扰理论框架得到不同偏振下的三重微分截面公式，验证了解析结果与数值计算的一致性，明确原子靶缀饰对电离过程的显著影响。
摘要：
我们在中等激光强度、光子能量超出软光子近似的条件下，基于一阶玻恩近似框架，对氢原子中快电子参与的激光辅助（e,2e）电离碰撞开展了理论研究。我们采用Gordon-Volkov波函数非微扰地处理激光场与入射电子、散射电子及出射电子的相互作用，同时使用一阶微扰理论处理原子缀饰。在该半微扰形式体系内，我们得到了适用于线偏振与圆偏振的非线性三重微分截面（TDCS）的闭式公式，并在弱场区与低光子能极限下推导了TDCS的简化解析表达式。研究发现，对于非共振（e,2e）反应，低光子能极限下得到的原子矩阵元解析公式，在定性与定量上均与半微扰模型的数值计算结果吻合良好。我们在非对称共面几何中研究了光子能量以及出射电子动能对TDCS的影响，结果表明原子靶的缀饰会强烈影响（e,2e）电离过程。我们还讨论了TDCS中出射电子与散射电子之间的交换效应。
英文摘要：
We present the theoretical treatment of laser-assisted $(e,2e)$ ionizing collisions in hydrogen for fast electrons, in the framework of the first-order Born approximation at moderate laser intensities and photon energies beyond the soft-photon approximation. The interaction of the laser field with the incident, scattered, and ejected electrons is treated nonperturbatively by using Gordon-Volkov wave functions, while the atomic dressing is treated by using first-order perturbation theory. Within this semiperturbative formalism, we obtain a closed-form formula for the nonlinear triple differential cross section (TDCS), which is valid for linear as well circular polarizations. Analytical simple expressions of TDCS are derived in the weak field domain and low-photon energy limit. It was found that for non-resonant $(e,2e)$ reactions, the analytical formulas obtained for the atomic matrix element in the low-photon energy limit give a good agreement, qualitative and quantitative, with the numerical semiperturbative model calculations. We study the influence of the photon energy as well of the kinetic energy of the ejected electron on the TDCS, in the asymmetric coplanar geometry, and show that the dressing of the atomic target strongly influences the $(e, 2e)$ ionization process. We discuss the exchange effects between the ejected and scattered electrons in the TDCS.
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