Plogmaker Stefan, Linusson Per, Eland John H D, Baker Neville, Johansson Erik M J, Rensmo Håkan, Feifel Raimund, Siegbahn Hans
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Rev Sci Instrum. 2012 Jan;83(1):013115. doi: 10.1063/1.3677329.
A novel light chopper system for fast timing experiments in the vacuum-ultraviolet (VUV) and x-ray spectral region has been developed. It can be phase-locked and synchronized with a synchrotron radiation storage ring, accommodating repetition rates in the range of ~8 to ~120 kHz by choosing different sets of apertures and subharmonics of the ring frequency (MHz range). Also the opening time of the system can be varied from some nanoseconds to several microseconds to meet the needs of a broad range of applications. Adjusting these parameters, the device can be used either for the generation of single light pulses or pulse packages from a microwave driven, continuous He gas discharge lamp or from storage rings which are otherwise often considered as quasi-continuous light sources. This chopper can be utilized for many different kinds of experiments enabling, for example, unambiguous time-of-flight (TOF) multi-electron coincidence studies of atoms and molecules excited by a single light pulse as well as time-resolved visible laser pump x-ray probe electron spectroscopy of condensed matter in the valence and core level region.
已开发出一种新型光斩波器系统，用于真空紫外（VUV）和X射线光谱区域的快速定时实验。它可以与同步辐射储存环锁相并同步，通过选择不同的孔径组和环频率的分谐波（兆赫兹范围），可适应约8至约120kHz的重复率。此外，该系统的开启时间可从几纳秒变化到几微秒，以满足广泛应用的需求。通过调整这些参数，该装置可用于从微波驱动的连续氦气放电灯或通常被视为准连续光源的储存环产生单个光脉冲或脉冲包。这种斩波器可用于许多不同类型的实验，例如，对由单个光脉冲激发的原子和分子进行明确的飞行时间（TOF）多电子符合研究，以及对价电子和芯能级区域的凝聚态进行时间分辨可见激光泵浦X射线探测电子能谱研究。
