Measurements of inelastic collisions of ${\mathrm{F}}^{+}$ with Ne have been made. Transitions between ${}_{}{}^3{}_{}{}^{}\mathrm{P}$ and ${}_{}{}^1{}_{}{}^{}\mathrm{D}$ terms of ${\mathrm{F}}^{+}$ are seen, with the inelastically scattered ions sharply focused in the forward direction. Potential energy curves of (FNe${)}^{+}$ have been calculated. The ${}_{}{}^3{}_{}{}^{}\mathrm{\Sigma }$ and ${}_{}{}^3{}_{}{}^{}\mathrm{\Pi }$ curves correlating to ${\mathrm{F}}^{+}$${(\mathrm{}}^3$P) are repulsive, while the ${}_{}{}^1{}_{}{}^{}\mathrm{\Sigma }$ correlating to ${\mathrm{F}}^{+}$${(\mathrm{}}^1$D) is attractive. Several curve crossings are identified, where transitions occur through spin-orbit coupling. Scattering angles and differential cross sections have been calculated, and they show the presence of a ‘‘glory’’ (or halo) effect, which accounts for the forward scattering of ions.

• Received 16 December 1986

DOI:https://doi.org/10.1103/PhysRevA.35.4515