Formation of negative ions from fluorine projectiles scattered off a MgO(100) surface: Theory

We present a parameter-free theoretical study of the negative-ion productio n from fluorine projectiles during low-energy (0.5-4 keV), small incidence angle (3.5 degrees) collisions with a MgO(100) surface. Our calculations an based on the binary encounter model developed to describe the electron cap ture by a projectile upon collision with an insulating ionic crystal surfac e . For the low-velocity behavior of the negative-ion yield, good agreement is obtained between our theoretical results and the available experimental data by S. Ustaze et al. [S1050-2947(99)09805-4].