Experimental and theoretical results on electron emission from helium by the impact of bare Li3+ ions

J. M. MONTI; D. FREGENAL; S. SUÁREZ; P. D. FAINSTEIN; R. D. RIVAROLA; G. BERNARDI; J. FIOL

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

IOP PUBLISHING LTD

Lugar: Bristol; Año: 2012 vol. 45 p. 1452021 - 1452027

0953-4075

We investigate experimentally and theoretically the ionization of helium atoms by the impact of bare Li3+ projectiles at intermediate and high incident energies. We report on measured absolute values of doubly differential cross-sections, as a function of the emitted electron energies and angles, at collision energies of 200 and 440 keV u−1. Different physical aspects of the reaction are interpreted theoretically by comparison of the data with quantum-mechanical continuum distorted wave and continuum distorted wave–eikonal initial state calculations as well as classical trajectory Monte Carlo simulations. There is overall a good agreement of the calculations with the experimental data, which improves considerably for higher collision energies.3+ projectiles at intermediate and high incident energies. We report on measured absolute values of doubly differential cross-sections, as a function of the emitted electron energies and angles, at collision energies of 200 and 440 keV u−1. Different physical aspects of the reaction are interpreted theoretically by comparison of the data with quantum-mechanical continuum distorted wave and continuum distorted wave–eikonal initial state calculations as well as classical trajectory Monte Carlo simulations. There is overall a good agreement of the calculations with the experimental data, which improves considerably for higher collision energies.−1. Different physical aspects of the reaction are interpreted theoretically by comparison of the data with quantum-mechanical continuum distorted wave and continuum distorted wave–eikonal initial state calculations as well as classical trajectory Monte Carlo simulations. There is overall a good agreement of the calculations with the experimental data, which improves considerably for higher collision energies.