Experimental demonstration of high quality MeV ultrafast electron diffraction.
The simulation optimization and an experimental demonstration of improved performances of mega-electron-volt ultrafast electron diffraction (MeV UED) are reported in this paper. Using ultrashort high quality electron pulses from an S-band photocathode rf gun and a polycrystalline aluminum foil as the sample, we experimentally demonstrated an improved spatial resolution of MeV UED, in which the Debye-Scherrer rings of the (111) and (200) planes were clearly resolved. This result showed that MeV UED is capable to achieve an atomic level spatial resolution and a approximately 100 fs temporal resolution simultaneously, and will be a unique tool for ultrafast structural dynamics studies.
Li
Renkai
R
Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China. lrk@mails.thu.edu.cn
Tang
Chuanxiang
C
Du
Yingchao
Y
Huang
Wenhui
W
Du
Qiang
Q
Shi
Jiaru
J
Yan
Lixin
L
Wang
Xijie
X
D017607:Aluminum Compounds / Q000737:chemistry; D003198:Computer Simulation; D004583:Electrons; D007700:Kinetics; D007834:Lasers; D012542:Scattering, Radiation; D013997:Time Factors; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction / Q000295:instrumentation
D017607:Aluminum Compounds