Quasiresonant charge transfer in inner-shell excitation: Impact-parameter dependence ofK-vacancy creation inFq+→Necollisions

The impact-parameter dependence of Ne $K$-Auger emission probability has been studied for 4.4- and 10-MeV F projectiles in incoming charge states $6^{+}$ and $8^{+}$, i.e., without and with a $K$ vacancy in the entrance channel of the collisions. The strong enhancement in the emission probability for collisions with an initial $K$ vacancy is attributed to $K-K$ quasiresonant charge transfer. For the smaller collision velocity, i.e., for 4.4-MeV collision energy and a projectile charge state $q=8\mathrm{}$, the $K-K$ quasiresonant transfer is dominated by a destructive interference of contributions to the excitation amplitude from the incoming and outgoing parts of the trajectory.