Ionization of the He, Ne, Ar, Kr, and Xe isoelectronic series by proton impact

J. E. MIRAGLIA; M. S. GRAVIELLE

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

APS

Lugar: N.Y.; Año: 2008 vol. 78 p. 52705 - 527057

1050-2947

In this paper we report ionization cross sections of positive Li+, Na+, K+, Rb+, neutral He, Ne, Ar, Kr, Xe, and negative F-, Cl-, Br-, I- ions by impact of protons with energies ranging from 25 to 1000 keV. Cross sections of singly charged ions are relevant to the calculation of electron yields in collisions with insulator surfaces. Calculations were performed within the continuum distorted wave–eikonal initial state method using an angular expansion in spherical harmonics and a numerical evaluation of the radial functions corresponding to both the initial
bound and the final
continuum states. The first Born approximation was used on an equal footing. We find that this first-order theory holds for proton energies larger than 300 keV. For comparison, we also calculate the shellwise local plasma approximation. Our results show that it gives a good account of the cross sections for neutral targets.+, Na+, K+, Rb+, neutral He, Ne, Ar, Kr, Xe, and negative F-, Cl-, Br-, I- ions by impact of protons with energies ranging from 25 to 1000 keV. Cross sections of singly charged ions are relevant to the calculation of electron yields in collisions with insulator surfaces. Calculations were performed within the continuum distorted wave–eikonal initial state method using an angular expansion in spherical harmonics and a numerical evaluation of the radial functions corresponding to both the initial
bound and the final
continuum states. The first Born approximation was used on an equal footing. We find that this first-order theory holds for proton energies larger than 300 keV. For comparison, we also calculate the shellwise local plasma approximation. Our results show that it gives a good account of the cross sections for neutral targets.