MULTIPLE ELECTRON PROCESSES IN NEON AND WATER TARGETS COLLIDING WITH PROTONS BEAMS

P.R. MONTENEGRO; C. CHAMPION; P.N. TEREKHIN; J.M. MONTI; R. D. RIVAROLA; M.A. QUINTO; O. A. FÓJON

Kielce

Conferencia; HCI 2016 is the 18th in a series of International Conferences on the Physics of Highly Charged Ions.; 2016

Multiple electron processes in atomic and molecular collisions induced by ion impact are offundamental interest in many areas such as tumor treatment [1], thermonuclear fusion [2], andplasma physics [3]. A particular charge state of the residual target may be produced by thecombination of single electron reactions. Therefore, it is important to understand each of themto elucidate the basic governing mechanisms in multiple electron processes.Proton impact on Ne and water targets are chosen in this work to investigate theoreticallymultiple electron processes at intermediate and high collision energies. The ContinuumDistorted Wave-Eikonal Initial State approximation (CDW-EIS) [4] is used to calculatetransition probabilities (capture and ionization) as a function of the impact parameter andabsolute cross sections for the considered collisions. The Roothaan?Hartree?Fock (RHF)wavefunctions [5] were used to represent the atomic states of Ne. The initial wavefunctions ofthe active electrons bound to a particular water molecular orbital are described employing thecomplete neglect of the differential overlap (CNDO) approximation [6]. A trinomialdistribution analysis has been employed to compute exclusive probabilities using theindependent electron (IEL) model, where electron correlation is neglected [7].From the comparison with the available theoretical and experimental results, we conclude thatexclusive probabilities are required for a reliable description of the processes of interest.Finally, we note that the present approach could be used as a basis for obtaining multipleelectron processes cross sections for targets such as macromolecules of DNA and RNA tomodel scenarios for the radiobiological consequences of the impact of charged energeticparticles on those macromolecules.References[1] A. Brahme, Int. J. Radiat. Oncol. Biol. Phys. 58, 603 (2004)[2] Simon S. Yu, B.G. Logan, J.J. Barnard et al., Nucl. Fusion 47, 721 (2007)[3] I. Murakami, J. Yan, H. Sato et al., At. Data Nucl. Data Tables 94, 161 (2008)[4] P.D. Fainstein, V.H. Ponce and R.D. Rivarola, Phys. B: At. Mol. Opt. Phys. 24, 3091(1991)[5] C. Clementi and C. Roetti, At. Data Nucl. Data Tables 14, 177 (1974)[6] J. Pople, D. Santry and G. Segal, J. Chem. Phys. 43, S129 (1965)[7] J. Bradley, R. J. S Lee, M. McCartney and D. S. F. Crothers, J. Phys. B: At. Mol. Opt.Phys. 37, 3723 (2004)