Unique linear picosecond electron accelerator in Europe devoted to pulse radiolysis


ELYSE is a platform born from the will of the physico-chemists of the CNRS and the University Paris 11 (nowadays University Paris-Saclay, Institute of Chemical Physics UMR8000 CNRS) by pooling skills, human resources and scientific equipment for the study of elementary chemical and biochemical reactions in ultra-short times.

As a tool for fundamental research, ELYSE offers high-performance equipment for the study of ultrafast chemical reactions.


The study of elementary chemical and biochemical acts by techniques in “ultra-short” times constitutes a part of science in full expansion: what chemist has not wished to see (or “film”) the detail of the movements of molecules at the moment when the transformation of matter takes place? This dream is a reality.

The vocation of ELYSE is to trigger in a short time the physical and/or chemical phenomena generated by the passage of a high-energy electron beam, or laser beams, and to observe them by detection methods resolved in time, often by UV-Vis spectroscopy.


  • The excited states in condensed phase
  • The primary effects in radiolysis
  • Radical chemistry on surfaces
  • Bio-relavent radical chemistry: DNA damage, etc.


The platform consists of several independant experimental setups for conducting radiolysis experiments:

  • pulse-probe spectroscopy with stroboscopic detection 10ps-11.5ns broad-range 350-1450nm
  • pulse-probe spectroscopy with streak-camera detection 1ns-1ms
  • pulse-pump-probe spectroscopy with 100fs resolution and waiting time 0-6ns
  • pulse electrochemistry
  • radiolysis of solutions under gas pressure (150 atm)