标题： 近零能量光电子在长波长极限下强场隧穿电离中的动量分布 显示英文标题

标题： Momentum Distribution of Near-Zero-Energy Photoelectrons in the Strong-Field Tunneling Ionization in the Long Wavelength Limit

摘要： 我们研究了氩原子在波长高达3100纳米的超短强激光照射下的电离动力学，探讨了近零能量光电子的动量分布。 我们发现对应于毫电子伏特能量的动量分布中出现了令人惊讶的聚集，并且在稍大的横向动量处出现了类似\textquotedblleft V"-的结构。 半经典模拟表明，在极远距离下逃逸电子与剩余离子之间的库仑吸引力起着关键作用。 追溯经典轨迹，我们发现出生于某一特定场相位窗口和横向速度的隧穿电子导致了显著的聚集。 我们的理论结果与最近的毫电子伏特分辨高精度测量结果一致。 显示英文摘要

摘要： We investigate the ionization dynamics of Argon atoms irradiated by an ultrashort intense laser of a wavelength up to 3100 nm, addressing the momentum distribution of the photoelectrons with near-zero-energy. We find a surprising accumulation in the momentum distribution corresponding to meV energy and a \textquotedblleft V"-like structure at the slightly larger transverse momenta. Semiclassical simulations indicate the crucial role of the Coulomb attraction between the escaping electron and the remaining ion at extremely large distance. Tracing back classical trajectories, we find the tunneling electrons born in a certain window of the field phase and transverse velocity are responsible for the striking accumulation. Our theoretical results are consistent with recent meV-resolved high-precision measurements.