Femto-second pulse radiolysis system is developed for the study of the electron beam induced reaction in materials. Femtosecond electron pulse was generated by optimizing the laser photocathode RF electron gun accelerator. 240 fs time resolution was achieved by femtosecond electron pulse and formation of hydrated electron was observed by femtosecond pulse radiolysis. For more fine time resolution of the pulse radiolysis, the Equivalent velocity spectroscopy (EVS) method is required to avoid degradation of time resolution caused by velocity difference between electron and light in sample.
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