Development of a linac-based LEPD experimental station for surface structure analysis and coordination with synchrotron radiation ARPES
Abstract
We report on the development of a low-energy positron diffraction (LEPD) experimental station for surface structure analysis using a linac-based slow-positron beam. LEPD, the positron counterpart of low-energy electron diffraction (LEED), offers higher accuracy in surface structure determination. The station enables acquisition of LEPD I-V curves within a few hours, allowing measurements before surface degradation occurs. It consists of two ultra-high vacuum (UHV) chambers: one for sample preparation and the other for LEPD observations. The preparation chamber includes an Ar+ sputtering system, a triple-pocket electron beam evaporator, three gas introduction systems, additional user-configurable ports, and a LEED/Auger electron spectroscopy (AES) system. Sample manipulators enable rapid cooling, precise positioning, and orientation adjustments. In the preparation chamber, the manipulator also supports direct current heating up to 1200 {\deg}C. The sample holder is compatible with the LEPD station at SPF-A4 and the ARPES station at PF BL-13B, both located at the Tsukuba campus of the Institute of Materials Structure Science (IMSS), KEK. Design concepts and experimental demonstrations are presented.
Keywords
Cite
@article{arxiv.2501.00188,
title = {Development of a linac-based LEPD experimental station for surface structure analysis and coordination with synchrotron radiation ARPES},
author = {Rezwan Ahmed and Izumi Mochizuki and Toshio Hyodo and Tetsuroh Shirasawa and Seigi Mizuno and Yoshinari Kondo and Kenichi Ozawa and Miho Kitamura and Kenta Amemiya and Bartlomiej Checinski and Jozef Ociepa and Achim Czasch and Ottmar Jagutzki and Ken Wada},
journal= {arXiv preprint arXiv:2501.00188},
year = {2025}
}
Comments
23 pages, 7 figures