Abstract
A model is described in which the ion emission from solid surfaces is triggered by the primary projectile Coulomb field, before the projectile-surface collision. This Pre-Impact Desorption (PID) model considers that projectiles, with charge qe and velocity v, cause: i) electron emission prior to their collision with the target and ii) partial relaxation of the surface ionized species via ion desorption. A q 3-dependence is predicted for the desorption yield of H + ions; this result has been observed experimentally for different projectile-target pairs and for several projectile energies in the keV—MeV range. The model predicts a maximum desorption yield occurring at projectile velocities around the Bohr velocity, a linear dependence with v for very low velocities and a 1 v dependence in the very high v regime. Analytical expressions are also obtained for the surface charge distribution produced around single impacts.
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