Relativistic second-order Oppenheimer-Brinkman-Kramers cross sections for electron capture

Cross sections for s-state to s-state electron capture from a target atom to a completely stripped projectile ion are calculated using a relativistic form of the second-order Oppenheimer-Brinkman-Kramers (OBK) approximation to the leading order in the fine-structure constant. These theoretical cross sections are compared with the experimental data of Crawford and co-workers [Crawford, Ph.D. thesis, University of California (1979); Gould et al., Nucl. Instrum. Methods B 10, 32 (1985)], analyzed by Anholt [Phys. Rev. A 31, 3579 (1985)], for bare C, Ne, and Ar projectile ions incident with 140, 250, 400, 1050, and 2100 MeV/amu energies on various atomic targets. Quite good results are obtained, the calculated capture-cross-section values lying between the minimum and maximum values derived from the experimental data in most cases and often fairly close to the most probable values of the capture cross sections given by Anholt