Abstract
We report observations of simultaneous electron excitation and electron capture in ion-atom collisions of 97-MeV ${\mathrm{Ca}}^{18+}$ and ${\mathrm{Ca}}^{19+}$ in an argon gas target. X-ray spectra at energies near 3.9 keV were collected using a high-resolution x-ray spectrometer. We have resolved transitions from doubly excited 1s2l2l' and 1s2l3l' states to singly excited 1${\mathit{s}}^{2}$2l' and 1${\mathit{s}}^{2}$3l' states in lithiumlike calcium. The observed transitions lie at energies close to the 1s2s-1s2p resonance transitions in heliumlike calcium. We compare the experimental wavelengths and intensities with relativistic Hartree-Fock calculations, and discuss the excitation mechanisms.
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