Corrected closure approximation for electron loss from fast hydrogen atoms passing through atomic hydrogen. II

Abstract

For pt.I see ibid., vol.8, p.442 (1975). Computational errors of the authors in a previous paper on electron loss from fast hydrogen atoms passing through atomic hydrogen are rectified. The revised cross sections considerably exceed the results of the standard first Born approximation given by Bates and Griffing (1953). The loss cross sections due to Bates and Griffing are correct. Their neglect of discrete states of the target hydrogen atom with principal quantum number n>3 produces an error not greater than three per cent at any impact energy. The corrected closure approximation is significantly improved taking full account of the continuum of the target atom. It is shown that the corrected closure approximation converges more rapidly that the usual procedure in the first Born approximation. Present upper and lower bounds to loss cross sections are in excellent agreement with the results obtained by the first Born approximation without use of the added closure approximation.