主講人：石川裕也 福井大學（日本）助理教授

時間：2024年5月31日10：00

地點：數理學院222會議室

舉辦單位：數理學院

主講人介紹：日本福井大學助理教授，工學博士，日本紅外科學與技術學會會員、日本電子自旋共振學會執行會員、日本物理學會會員；主攻太赫茲電子順磁共振技術與應用。

內容介紹：We constructed a new multifrequency electron spin resonance (ESR) system by combining a compact-type gyrotron named FU CW CIA and a force-detection ESR measurement system with a variable temperature cryostat which can be used in the temperature range 5-300 K. Multifrequency ESR signals of 1,1-diphenyl-2- picrylhydrazyl (DPPH) were successfully detected at room temperature in the fundamental oscillation region of the gyrotron source (108–206 GHz). The sensitivity was obtained to be in the order of 1012 spins/G from the ESR measurement of Cu(C4H4N2)(NO3)2 at room temperature. These results indicate that the combination of a high-power wave-source gyrotron with multifrequency oscillation and a force-detection system is well matched to enable multifrequency ESR measurements over a wide temperature range from room temperature to cryogenic temperatures.