Abstract
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.
Highlights
The one-step process of radiative electron capture (REC) [1,2] occurs when a loosely bound target electron is captured into a projectile and can be treated as the time-reversed process of photoionization (PI) [3]
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 a one-step process in ion-atom collisions occurring when two target electrons are captured to a bound state of the projectile during a single collision with the simultaneous emission of a single photon
Summary
The one-step process of radiative electron capture (REC) [1,2] occurs when a loosely bound target electron is captured into a projectile and can be treated as the time-reversed process of photoionization (PI) [3]. Double photoionization (DPI) [4] can be studied by the investigation of the time-reversed process of radiative double electron capture (RDEC) by bare projectile ions in collisions with atoms. RDEC is a one-step process in ion-atom collisions occurring when two target electrons are captured to a bound state of the projectile during a single collision with the simultaneous emission of a single photon. To optimize for the best experimental conditions under which RDEC can be observed, solid targets were chosen in nonrelativistic collisions to obtain the highest rates of double electron capture [13]. A characteristic velocity considerably smaller than that of the projectile even for ∼1-MeV/u collisions Such comparisons in addition to the theoretical predictions [7,8] suggesting projectiles of moderate Z for lower-energy collisions were the motivation to conduct the RDEC experiments under these conditions
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