Young L, Arms D A, Dufresne E M, Dunford R W, Ederer D L, Höhr C, Kanter E P, Krässig B, Landahl E C, Peterson E R, Rudati J, Santra R, Southworth S H
Argonne National Laboratory, Argonne, Illinois 60439, USA.
Phys Rev Lett. 2006 Aug 25;97(8):083601. doi: 10.1103/PhysRevLett.97.083601. Epub 2006 Aug 21.
We have developed a synchrotron-based, time-resolved x-ray microprobe to investigate optical strong-field processes at intermediate intensities (10(14) - 10(15) W/cm2). This quantum-state specific probe has enabled the direct observation of orbital alignment in the residual ion produced by strong-field ionization of krypton atoms via resonant, polarized x-ray absorption. We found strong alignment to persist for a period long compared to the spin-orbit coupling time scale (6.2 fs). The observed degree of alignment can be explained by models that incorporate spin-orbit coupling. The methodology is applicable to a wide range of problems.
我们开发了一种基于同步加速器的时间分辨X射线微探针，用于研究中等强度（10¹⁴ - 10¹⁵ W/cm²）下的光学强场过程。这种量子态特异性探针能够通过共振、极化X射线吸收，直接观测氪原子强场电离产生的残余离子中的轨道取向。我们发现，与自旋 - 轨道耦合时间尺度（6.2飞秒）相比，强取向能持续较长时间。观测到的取向程度可以用包含自旋 - 轨道耦合的模型来解释。该方法适用于广泛的问题。
