Abstract
Radiative double electron capture (RDEC) observed in collisions of bare ions with atoms is a charge exchange process during which two target electrons are captured into a bound state of the projectile and a single photon is emitted. This process can be described as a time-reversed double photoionization. In bare ions, due to the lack of spectator electrons, it is the most reliable tool for observation of electron–electron correlation in electromagnetic fields produced in ion–atom collisions. An experiment conducted at Western Michigan University, using the tandem Van de Graaff accelerator, aiming at observation of the RDEC process during O8++C collisions at 38 MeV, provided the first experimental evidence of this process. In this paper, an extension of the data analysis of this experiment is presented, based on Monte Carlo simulation of the generated x-ray spectra. It is shown that the total measured RDEC cross-section value exceeds the theoretical predictions by a factor of more than 20.
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