Absolute cross sections for projectile electron loss accompanied by target multiple ionization in collisions of He+ with noble gases

作者：Santos A C F; Sigaud G M^*; Melo W S; Sant'Anna M M; Montenegro E C

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2011, 44(4): 045202.

DOI：10.1088/0953-4075/44/4/045202

Absolute cross sections for projectile electron loss accompanied by target multiple ionization in collisions between He+ ions and noble gases have been measured for energies between 1.0 and 3.5 MeV. The data have been compared with other absolute cross sections that exist in the literature for the same projectile, and with calculations for the screening mode (nucleus-electron interaction) using both perturbative (plane-wave Born approximation (PWBA)) and non-perturbative (extended classical-impulse free-collision model, sudden approximation and coupled-channel method) approaches, and for the antiscreening mode (electron-electron interaction) within the PWBA. The energy dependence of the average number of active electrons for the antiscreening has been described by means of a simple function, which is 'universal' for noble gases but projectile dependent. A previously developed method has been employed to obtain the number of active electrons for each target subshell in the high-velocity regime.

• 出版日期2011-2-28