Auger, resonant, and plasmon-assisted charge-transfer processes in atom-surface collisions
Abstract
The Keldysh Green's-function formalism is used to evaluate the atomic occupation number of a projectile colliding with a metal surface. This formalism has an advantage that allows us to handle simultaneously Auger, resonant, and plasmon-assisted exchange processes along with the interference between them. A time-dependent Hamiltonian containing Auger-like and resonantlike terms, and the electron-electron Coulomb potential in the solid, is proposed. The atomic self-energies are calculated up to a second order in the interaction potential. An effective resonant amplitude is defined, and Auger self-energies are presented where the plasmon-assisted processes are included through a surface response function. Finally, some numerical results for a proton colliding with an Al surface by using a simplified description of the solid response function are presented, where an analysis in terms of the incidence angle and the energy level is shown.
- Publication:
-
Physical Review B
- Pub Date:
- June 1998
- DOI:
- 10.1103/PhysRevB.57.14919
- Bibcode:
- 1998PhRvB..5714919V
- Keywords:
-
- 79.20.Rf;
- 73.20.Mf;
- 71.45.Gm;
- Atomic molecular and ion beam impact and interactions with surfaces;
- Collective excitations;
- Exchange correlation dielectric and magnetic response functions plasmons