KENBIKYO Vol.50▶No.3 2015
â– Feature Articles: Current Status of the Development of Ultrafast Electron Microscopes in Japan

Ultrafast Electron Microscopy Using Relativistic-Energy Femtosecond Electron Pulses

Jinfeng Yang

Abstract: An ultrafast detection technique on 100 fs time scales over sub-nanometer (even atomic) spatial dimensions has long been a goal for the scientists to reveal and understand the ultrafast structural-change induced dynamics in materials. In this paper, a technique of particle acceleration based radio-frequency (RF) electron gun, the generation of femtosecond electron pulses using the RF gun and the first prototype of femtosecond time-resolved relativistic-energy ultrafast electron microscopy (UEM) at Osaka University are reported. Finally, both relativistic-energy electron diffraction and image measurements in the UEM prototype are presented.

Key words: ultrafast electron microscopy, femtosecond electron pulse, Radio-frequency electron gun, TEM