Electron loss and capture by fast helium ions in noble gases

Resonant double electron capture by fast He2+ from helium: the first-order Born approximation with correct boundary condition

“…At lower energies the data of DuBois [4] confirm the tendency predicted by the measurement of Pivovar et al [2]. The newest experimental results of Schuch et al [7] agree with the data of de Castro Farina et al [5] at 1.5 MeV impact energy, however their experimental total cross section values are somewhat lower than it could be predicted from [5] at the highest energies.…”

“…The difference between the two cases reveals that the two-electron capture is very sensitive to the choice of the orbitals formed around the projectile. In a further study [6] the Continuum Distorted Wave Eikonal Initial States approximation (CDW-EIS) was applied, too, and a very good agreement with group of experiments [1,5] was found in the studied energy range 0.2-3.0 MeV [6].…”

“…1. Two types of the correlated CI-wave functions corresponding to the number 12 and 60 of one-electron unnormalized Slater orbitats (# = 3, 6 respectively, n+ k< # see (5,6)) were applied. The proper ground-state energy values are E o = -2.898 a.u.…”

“…2 below). The data from [1,5] are smooth continuation of each other while the results from [2,3] exhibit different qualitative dependence. At lower energies the data of DuBois [4] confirm the tendency predicted by the measurement of Pivovar et al [2].…”

“…The first experimental studies were performed several years ago [1][2][3]. Comparing these earlier results to the new ones [4,5] some deviation could be found in the energy dependence of the total cross section data in the impact energy range 0.4-6.0 MeV [6] (see Fig. 2 below).…”