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引用次数: 0
摘要
光电子的发射角与其电离时间之间的映射关系(即角-时间映射关系)对attoclock 测量非常重要。长期以来,角度-时间映射被假定为角度均匀的。最近的研究表明,低能电子在最小产率角上的角时映射是不连续的。然而,以前的研究结果是基于惰性气体原子的 s 电子初始态假设来解释的,很少有人研究初始轨道对称性对角时映射的影响。在这项研究中,我们以 F- 离子为例,研究了初始轨道对称性对时间能量分布的影响。我们证明了初始轨道对称性对时间能量分布的重大影响。鞍点法可以很好地解释这种行为。更有趣的是,我们发现在椭圆偏振激光场中,角度-时间映射与初始轨道对称性密切相关,尤其是对低能电子而言。我们的工作对进一步发展attoclock方案具有重要意义。
Effect of Orbital Symmetry on Time–Energy Distributions of F− Ions in the Attoclock Scheme
The mapping relation between the emission angle of the photoelectron and its ionization time (i.e., the angle–time mapping) is important for the attoclock measurement. For a long time, the angle–time mapping was assumed to be angularly uniform. Recent investigations have demonstrated that the angle–time mapping is discontinuous for the low-energy electron at the angle for the minimum yield. However, the previous results were interpreted based on the assumption of s-electron initial states for noble-gas atoms, and the effect of the initial orbital symmetry on the angle–time mapping has been rarely investigated. In this work, we investigate the influence of the initial orbital symmetry on time–energy distribution using F− ions as a specific example. We demonstrate that the initial orbital symmetry significantly impacts the time–energy distribution. This behavior can be well explained by the saddle-point method. More interestingly, it is found that the angle–time mapping is strongly dependent on the initial orbital symmetry in the elliptically polarized laser field, especially for the low-energy electrons. Our work holds great significance for further developing the attoclock scheme.