Femtosecond pulse radiolysis and femtosecond electron diffraction

• DOI: 10.1016/j.nima.2010.02.014
• Publication Date: 2010-02-11T11:44:51Z
• Authors: Jinfeng Yang; Koichi Kan; Takafumi Kondoh; Yoichi Yoshida; Katsumi Tanimura; Junji Urakawa
• Keywords: Photocathode; Ultrafast electron diffraction

Abstract A femtosecond pulse radiolysis with a time resolution of 210 fs has been developed by using a femtosecond electron beam and a femtosecond laser light. It has successfully opened the study of ultra-fast reactions or phenomena in materials—the first observation of the femtosecond formation process of the hydrated electron in water pulse radiolysis. The use of a photocathode femtosecond electron gun, which produces a near-relativistic 100 fs electron beam, has been approached to construct femtosecond megavolt electron diffraction. The dependencies of the emittance, bunch length, and energy spread on the radio-frequency (rf) and space-charge effects in the rf gun have been investigated.