Osawa Hitoshi, Ohkochi Takuo, Fujisawa Masami, Kimura Shigeru, Kinoshita Toyohiko
Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI), Kouto 1-1-1, Sayo, Hyogo 679-5198, Japan.
Synchrotron Radiation Laboratory, Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-0882, Japan.
J Synchrotron Radiat. 2017 May 1;24(Pt 3):560-565. doi: 10.1107/S1600577517002399. Epub 2017 Mar 20.
Two types of optical choppers for time-resolved measurements at synchrotron radiation soft X-ray beamlines have been developed. One type uses an air-spindle-type rotation mechanism with a two-stage differential pumping system to maintain the ultra-high vacuum of the X-ray beamline, and the other uses a magnetic bearing. Both can be installed at the soft X-ray beamlines at SPring-8, greatly improving the accessibility of pump-and-probe spectroscopy. The combination of X-ray chopper and pump-and-probe photoemission electron microscope at SPring-8 provides drastic improvements in signal-to-noise ratio and resolution compared with techniques using high-voltage gating of channel plate detectors. The choppers have the capability to be used not only at synchrotron radiation facilities but also at other types of soft X-ray and VUV beamlines.
已开发出两种用于同步辐射软X射线光束线时间分辨测量的光学斩波器。一种类型采用带有两级差动抽气系统的空气主轴型旋转机构来维持X射线光束线的超高真空，另一种则采用磁轴承。两者均可安装在SPring-8的软X射线光束线上，极大地提高了泵浦-探测光谱学的可达性。与使用通道板探测器高压门控的技术相比，SPring-8的X射线斩波器与泵浦-探测光发射电子显微镜的结合在信噪比和分辨率方面有了显著提高。这些斩波器不仅能够在同步辐射设施中使用，还能在其他类型的软X射线和真空紫外光束线上使用。
