DiChiara A D, Ghebregziabher I, Sauer R, Waesche J, Palaniyappan S, Wen B L, Walker B C
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA.
Phys Rev Lett. 2008 Oct 24;101(17):173002. doi: 10.1103/PhysRevLett.101.173002.
We present photoelectron measurements from argon ionization at 10(19) W/cm(2). Photoelectrons with energies above 400 keV, including a 1.2 MeV cutoff, are in quantitative agreement with a semiclassical, relativistic 3D ionization model that includes a nonparaxial laser field. L-shell photoelectrons have energies and momentum dominated by the field, including the acceleration out of the focus. Yields and angular distributions at 60 keV come from valence shell ionization by strong fields where rescattering and atomic processes determine photoelectron final states.
我们展示了在10¹⁹W/cm²强度下氩原子电离的光电子测量结果。能量高于400keV（包括1.2MeV截止能量）的光电子与一个包含非傍轴激光场的半经典相对论三维电离模型在定量上相符。L壳层光电子的能量和动量主要由场决定，包括从焦点处的加速。60keV处的产额和角分布来自强场下价壳层电离，其中再散射和原子过程决定了光电子的最终状态。
