Radiative Double Electron Capture in F$^{9+}$ + C Collisions

Radiative double electron capture (RDEC) is a fundamental process involving the capture of two electrons with the simultaneous emission of a single photon. For loosely bound target electrons RDEC can be treated as time reversed double photoionization in which the photon-electron interaction is the origin of electron emission, offering a tool for the exploration of problems in atomic systems such as the electron-electron interaction in electromagnetic fields or the search for a proper description of a two electron-continuum wave function. In the present work, both radiative electron capture (REC) and RDEC were investigated in collisions of 2.21 MeV/u bare and H-like fluorine ions with carbon foils. This experiment was conducted at Western Michigan University using the tandem Van de Graaff accelerator, with the emitted x-rays at 90\r{ } to the beam line measured in coincidence with singly- and doubly-charge changed ions. Current results are compared with previous measurements for O$^{8+}$ + C collisions [1] and with recent theoretical calculations [2-4].\\[0pt][1] A. Simon \textit{et al}., Phys. Rev. Lett. \textbf{104} (12), 123001 (2010) [2] A. I. Mikhailov \textit{et al}., Phys. Lett. A \textbf{328}, 350 (2004) [3] A. I. Mikhailov \textit{et al}., Phys. Rev. A \textbf{69}, 032703 (2004) [4] A. Nefiodov \textit{et al}., Phys. Lett. A \textbf{346}, 158 (2005).