Abstract
The capture of a quasifree target electron into the continuum of a heavy, fast projectile ion with simultaneous photon emission, known as radiative ionization (RI), is calculated within the relativistic impulse approximation, applying the partial-wave analysis. Comparison is made with the semirelativistic Sommerfeld-Maue (SM) theory and it is shown that there are considerable differences in the absolute cross sections for heavy projectiles and high collision energies. Absolute photon spectra, measured in the collisions of 96.6 MeV/amu U92+ + H2 and 213 MeV/amu U91+ + H2, are well reproduced by the fully relativistic approach.
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