The role of multiple electron processes for fast ion H2O collisions

BACHI, N.; OTERO, G.S.; OTRANTO, S.; OLSON, R.E.

Grapevine TX

Conferencia; 25th Interntational Conference on the application of accelerators in research and industry; 2018

Sandia National Laboratory, Norh Texas University

In this work, collision processes between C6+ , O8+ and Si13+ ions and H2O molecules that lead to target ionization are studied by means of the classical trajectory Monte Carlo method. We employ an 8-electron model in which the H2O electron densities and energies dynamically adapt during ionization processes to those corresponding to the H2O q+ ions by assuming vertical transitions between the different molecular ionic states. Net total ionization cross sections and single differential cross sections in energy and angle are shown for 4 MeV/u projectiles and compared to available experimental data and theoretical predictions from distorted wave models.