High-resolution x-ray spectral measurements are used to determine the relative intensity of x-ray transitions for ions such as fluorine excited in collisions with various-pressure Ne, Ar, and Kr gas targets, thin carbon foils, and a thick carbon slab. The relative intensities are observed to be nonlinearly dependent on both target density and incident charge Z. These effects are attributed to strong collisional quenching of initial states by subsequent large-impact-parameter collisions. The data permit extraction of the total quenching cross sections (σQ) for fast fluorine ions in various states. A strong enhancement of the relative intensity of 2P13 is observed for F7+ and O6+ projectiles. This strong enhancement is attributed to selective excitation of metastable states in the beam, i.e., 1s2s S13, into the 1s2p P13 state. Finally, the data for foil and solid targets are used to obtain information on the excitation states of ions moving in solids.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)