Unified dielectronic and radiative-recombination cross sections for U90+

Abstract

We have calculated unified photorecombination cross sections and independent-processes photorecombination cross sections for ${\mathrm{U}}^{90+}$ in the vicinity of the KLL resonances. For this case, where the radiative width of a level dominates the Auger width, we find relatively strong interference effects between the direct (radiative) and indirect (dielectronic) recombination processes. In particular, we find that the unified photorecombination cross section for the 1${\mathit{s}}^{2}$+${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}1${\mathit{s}}^{2}$2s+h\ensuremath{\nu} line is suppressed by a factor of 2 in the presence of the 1s2s(1)2p(3/2) resonance. Overall, however, the KLL recombination cross section is reduced by only 2--3 %, at most.