  Radiative double electron capture (RDEC), the one-step process occurring in
ion-atom collisions, has been investigated for bare fluorine ions colliding
with carbon. RDEC is completed when two target electrons are captured to a
bound state of a projectile simultaneously with the emission of a single
photon. This work is a follow-up to our earlier measurement of RDEC for bare
oxygen projectiles, thus providing a recipient system free of electron-related
Coulomb fields in both cases and allowing for the comparison between the two
collision systems as well as with available theoretical studies. The most
significant mechanisms of x-ray emission that may contribute to the RDEC energy
region as background processes are also addressed.
