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Title: Electron emission induced by resonant coherent interaction in ion-surface scattering at grazing incidence

The resonant coherent interaction of an ion with an oriented crystal surface, under grazing-incidence conditions with respect to a special direction of the crystal, gives rise to electron loss to the continuum from electronic bound states of the ion. The calculations presented below predict large probabilities for electron emission due to this mechanism. The electrons are emitted with well defined energies, expressed in terms of the condition of resonance. Furthermore, the emission takes place around certain preferential directions, which are determined by both the latter condition and the symmetry of the surface lattice. Our calculations for MeV He[sup +] ions scattered at a W(001) surface along the [l angle]100[r angle] direction with glancing angle of 0--2 mrad indicate a yield of emission close to 1. Using heavier projectiles, one obtains smaller yields, but still large enough to be measurable in some cases (e.g., [approx]0.9 for 53 MeV B[sup 4+] and an angle of incidence of 1 mrad). Besides, the initial bound state is energy shifted due to the interaction with both the crystal potential and the velocity-dependent image potential. This results in a slight shift of the peaks of emission, which suggests a possible spectroscopy for analyzing the dynamical interactionmore » of electronic bound states with solid surfaces.« less
Authors:
 [1] ; ;  [2]
  1. (Departamento de Ciencias de la Computacion e Inteligencia Artificial, Facultad de Informatica, Universidad del Pais Vasco, Apartado 649, 20080 San Sebastian (Spain))
  2. (Departamento de Fisica de Materiales, Facultad de Quimica, Universidad del Pais Vasco, Apartado 1072, 20080 San Sebastian (Spain))
Publication Date:
OSTI Identifier:
5426666
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review, B: Condensed Matter; (United States); Journal Volume: 49:4
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; ELECTRON EMISSION; ION COLLISIONS; BOUND STATE; ELECTRONIC STRUCTURE; HELIUM IONS; INCIDENCE ANGLE; MEV RANGE; RESONANCE SCATTERING; CHARGED PARTICLES; COLLISIONS; EMISSION; ENERGY RANGE; INELASTIC SCATTERING; IONS; SCATTERING 665300* -- Interactions Between Beams & Condensed Matter-- (1992-)