论文标题

激光诱导的电离电离(OBI)状态中的电子衍射

Laser-induced electron diffraction in the over-the-barrier ionization (OBI) regime

论文作者

Belsa, B., Ziems, K. M., Sanchez, A., Chirvi, K., Liu, X., Grfe, S., Biegert, J.

论文摘要

大型多原子分子通常表现出低电离势,IP,导致已经处于相对较低强度(〜1013 w/cm2)的过度电离电离(OBI)。我们重新访问了激光诱导的电子衍射(LISE)(LISED),在屏障电离(OBI)方面,并回答有关使用LISE的分子结构成像是否可能发生的问题。我们采用类似氢的模型系统,使用基于经典的基于轨迹的模型(CT)模仿具有较低IP的分子,该模型(CT)结合了库仑电位。我们还将数值解决方案用于时间依赖的Schrodinger方程(TDSE)。具体而言,我们采用了LIED(FT-LIED)的傅立叶变换变体,以表明即使在OBI政权中短轨迹的重要贡献也不会排除从强场衍射模式中检索结构。这项理论研究表明,即使在OBI政权内发生电离,经典的回忆模型也可以很好地描述谎言。这项研究为基于强场电子回忆实时实时的大型多原子分子的化学转化铺平了良好的景观。

Large polyatomic molecules typically exhibit low ionization potentials, Ip, leading to over-the-barrier ionization (OBI) already at relatively low intensities (~1013 W/cm2). We revisit laser-induced electron diffraction (LIED) in the over-the-barrier ionization (OBI) regime and answer the question of whether imaging of molecular structure is still possible with LIED. We employ a hydrogen-like model system mimicking a molecule with low Ip using a classical trajectory-based model (CT) that incorporates the Coulomb potential; we also use the numerical solution to the time-dependent Schrodinger equation (TDSE). Specifically, we adopt the Fourier transform variant of LIED (FT-LIED) to show that even a significant contribution of short trajectories in the OBI regime does not preclude structure retrieval from strong-field diffractive patterns. This theoretical investigation shows that LIED can be well described by the classical recollision model even when ionization occurs within the OBI regime. This study paves the way towards strong-field imaging of chemical transformations of large polyatomic molecules in real-time based on strong-field electron recollision.

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