Cross sections for radiative recombination and the photoelectric effect inthe K, L, and M shells of one-electron systems with 1 <= Z <= 112 calculated within an exact relativistic description

An extensive tabulation of total cross sections for radiative recombination and, consequently, for the photoelectric effect of hydrogenlike ions with charge numbers 1 less than or equal to Z less than or equal to 112 is prese nted for the K, L, and M shells and electron energies ranging from closely above the threshold to the relativistic regime. The cross sections, accurat e to three digits, are based on fully relativistic calculations including t he effects of the finite nuclear size and all multipole orders of the photo n field. The cross sections for radiative recombination are displayed as a function of the electron energy. By a simple scaling, the dependence on the projectile energy in MeV/u can be derived for accelerator experiments, and , by using elementary formulas, the cross section for the photoelectric eff ect is obtained as a function of the photon energy. Furthermore, it is poin ted out how to scale the cross sections for the capture of heavy Dirac part icles. In order to assess the accuracy of cross sections derived from the w idely used nonrelativistic dipole approximation, we present a comparison wi th exact relativistic results for a few representative cases. (C) 2000 Acad emic Press.