Determination of radiolytic yield in a spatio-temporal structure of ionization tracks of high energy heavy ion is the big challenge in liquid water for radiation chemistry modeling of high LET (linear energy transfer) particles especially in a context of nuclear plant and in hadrontherapy. ^•OH radical is the most oxidant species evolved in radiation chemistry processes immediately following the ionization of water molecule. It is formed within the femtosecond.

Simultaneous effects of LET and temperature, if we consider them in competition, could then reveal the dynamic structure of radicals around the track. To access to these information, the experimental challenge was designing a specific optical flow cell resistant pressure, temperature and letting the ions reaching the solution, knowing these ions have short range in material. These experiments were performed at GANIL in collaboration with CIRIL.