Double ionization of helium by proton impact: A generalized-Sturmian approach

M.J. AMBROSIO, D.M. MITNIK, L.U. ANCARANI, G. GASANEO, AND E.L. GAGGIOLI

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

AMER PHYSICAL SOC

Lugar: New York; Año: 2015 vol. 92 p. 42704 - 42714

1050-2947

the generalized-Sturmian-functions methodology and within a perturbative treatment of the projectile-targetinteraction. The cross-section information is extracted from the asymptotic behavior of the numerical three-bodyfunction that describes the emission process. Our goal is to provide benchmark first-order Born fully differentialcross sections with which one may investigate the suitability of transition matrices calculated using approximateanalytic-type solutions for the double continuum (the choice of effective charges or effective momenta to partiallyaccount for the internal target interactions being, to some extent, arbitrary).We also provide fully differential crosssections for the low-ejection-energy regime, which is beyond the suitable range of such perturbative methods.We find, however, that the effective momentum approach allows one to get at least a rough characterization ofthe most dominant physical process involved. We also compare our calculations with the only available relativeexperimental set, showing an agreement in shape that can be well understood within the given momentum transferregime.