Stebel L, Malvestuto M, Capogrosso V, Sigalotti P, Ressel B, Bondino F, Magnano E, Cautero G, Parmigiani F
Sincrotrone Trieste, S.S. 14 km 163.5, Area Science Park, 34149 Basovizza (Ts), Italy.
Rev Sci Instrum. 2011 Dec;82(12):123109. doi: 10.1063/1.3669787.
Here, we report on a novel experimental apparatus for performing time-resolved soft x-ray absorption spectroscopy in the sub-ns time scale using non-hybrid multi-bunch mode synchrotron radiation. The present setup is based on a variable repetition rate Ti:sapphire laser (pump pulse) synchronized with the ~500 MHz x-ray synchrotron radiation bunches and on a detection system that discriminates and singles out the significant x-ray photon pulses by means of a custom made photon counting unit. The whole setup has been validated by measuring the time evolution of the L(3) absorption edge during the melting and the solidification of a Ge single crystal irradiated by an intense ultrafast laser pulse. These results pave the way for performing synchrotron time-resolved experiments in the sub-ns time domain with variable repetition rate exploiting the full flux of the synchrotron radiation.
在此，我们报告一种新型实验装置，该装置利用非混合多束模式同步辐射，在亚纳秒时间尺度上进行时间分辨软X射线吸收光谱实验。目前的装置基于一台可变重复率钛宝石激光器（泵浦脉冲），它与约500 MHz的X射线同步辐射束同步，还基于一个检测系统，该系统通过定制的光子计数单元来区分并挑选出重要的X射线光子脉冲。通过测量在强超快激光脉冲辐照下锗单晶熔化和凝固过程中L(3)吸收边的时间演化，整个装置得到了验证。这些结果为利用同步辐射的全部通量，在亚纳秒时域内以可变重复率进行同步辐射时间分辨实验铺平了道路。
