We report the measurement of electrons scattered superelastically from high
ly charged ions having an initial K-shell vacancy. In this process, the sca
ttered electron gains similar to 725 eV of energy from the deexcitation of
an excited He-like F7+(1s2s(3)S) metastable ion to its ground state. Theore
tical calculations based on an R-matrix approach agree well in position, sh
ape, and magnitude with the experimental data.