Kan-Ene Topics! 環エネTOPICS!


Jinfeng YANG

Position:      Associate Professor
Degree:       Doctor of Science
Laboratory: Quantum Beam Material Process Engineering


Ultrafast electron microscopy with relativistic femtosecond electron pulses

Femtosecond atomic-scale imaging is a challenging subject in material science and has long been a revered tool for scientists wishing to study ultrafast structural dynamics. In our research, we aim to develop an innovative relativistic ultrafast electron microscope (UEM) with an ultimate temporal-spatial resolution of 100 femtoseconds and 1 angstrom using advanced radio-frequency accelerator technology.

With our UEM, the photo-induced ultrafast phase transitions, the chemical reactions of molecules, and the structural dynamics in biomaterials are investigated in real time and on an atomic scale. The obtained information is compared with theoretical descriptions, based on the molecular dynamic method and first-principle calculation, to further encourage the discovery of new knowledge and novel functions in material science.


  1. Yang, Y. Yoshida, H. Yasuda, “Ultrafast electron microscopy with relativistic femtosecond electron pulses”, Microscopy, 67, 291-295(2018).
  2. Yang, Y. Yoshida, ”Relativistic ultrafast electron microscopy: single-shot diffraction imaging with femtosecond electron pulses”, Advances in Condensed Matter Physics, 2019, 9739241(2019).
  3. Yang, K. Gen, N. Naruse, S. Sakakihara, Y. Yoshida, ”A compact ultrafast electron diffractometer with relativistic femtosecond electron pulses”, Quantum Beam Science, 2020, 4, 4(2020).
  4. 著書 Yang, «Femtosecond Imaging», InTechOpen, 2020, Online ISBN 978-1-83880-052-9.
  5. 著書 Yang, Chapter 1: “Ultrafast electron microscopy with relativistic femtosecond electron pulses”, in «Electron Microscopy – Novel Microscopy Trends» edited by M. Arita, N. Sakaguchi, InTechOpen, 2019, Print ISBN 978-1-83881-882-1, Online ISBN 978-1-83881-883-8.