Drescher M, Hentschel M, Kienberger R, Uiberacker M, Yakovlev V, Scrinzi A, Westerwalbesloh Th, Kleineberg U, Heinzmann U, Krausz F
Institut für Photonik, Technische Universität Wien, Gusshausstrasse 27, A-1040 Wien, Austria.
Nature. 2002 Oct 24;419(6909):803-7. doi: 10.1038/nature01143.
The characteristic time constants of the relaxation dynamics of core-excited atoms have hitherto been inferred from the linewidths of electronic transitions measured by continuous-wave extreme ultraviolet or X-ray spectroscopy. Here we demonstrate that a laser-based sampling system, consisting of a few-femtosecond visible light pulse and a synchronized sub-femtosecond soft X-ray pulse, allows us to trace these dynamics directly in the time domain with attosecond resolution. We have measured a lifetime of 7.9(-0.9)(+1.0) fs of M-shell vacancies of krypton in such a pump-probe experiment.
迄今为止，核心激发原子弛豫动力学的特征时间常数是通过连续波极紫外或X射线光谱法测量的电子跃迁线宽推断出来的。在此，我们证明了一种基于激光的采样系统，由几个飞秒的可见光脉冲和一个同步的亚飞秒软X射线脉冲组成，使我们能够在时域中以阿秒分辨率直接追踪这些动力学过程。在这样一个泵浦-探测实验中，我们测量了氪M壳层空位的寿命为7.9（-0.9）（+1.0）飞秒。
