Multiple ionization processes related to irradiation of biological tissue

M. E. GALASSI, R. D. RIVAROLA, M. P. GAIGEOT, B. GERVAIS, M. BEUVE, R. VUILLEUMIER, P. D. FAINSTEIN, C. R. STIA Y M. F. POLITIS

Rosario

Conferencia; XXIV International Conference on Photonic, Electronic and Atomic Collisions; 2005

UNR-CONICET

Multiple ionization of water molecules, for impact of high LET ions, is included in a Monte Carlo simulation of liquid water radiolysis. According with suggestions of other authors, it is shown that the rearrangement of highly ionized water molecules is consistent with the production of excited atomic oxygen. A Car Parrinello molecular dynamics analysis shows that, after the Coulomb explosion of a double ionized water molecule in liquid water, the produced fragments of H+ and O do not recombien but migrate. The presence of the excess of oxygen is the responsible for the creation of a large amount of HO2/O2- radicals. The correponding Monte Carlo yields reproduce existing experimental data.