IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Electron emission by grazing scattering from Be(0001)
Autor/es:
C. D. ARCHUBI; M. S. GRAVIELLE; V. M. SILKIN
Lugar:
Valparaíso
Reunión:
Workshop; V Encuentro Sud Americano de Colisiones Inelásticas en la Materia; 2010
Resumen:
Recently
it has been demonstrated that occupied surface states can modify the
dielectric properties of metal surfaces [1]. Thus, with the aim of
investigating the influence of surface states on electron emission, we
study electron distributions originated by fast protons colliding
grazing with a Be(0001) surface. Beryllium presents a technological
interest in modern fusion reactors and it is expected that its surface
states play an important role in inelastic electronic processes.
To
describe the electron emission process we employ the
Band-structure-based (BSB) model [2], which includes an accurate
description of the electron-surface potential, incorporating information
about the band structure of the solid. Within
the BSB approach the surface interaction is described by a realistic
one-dimensional model potential [3], while the dynamic response of the
medium is derived in consistent way from the unperturbed electronic
states by using a linear response theory. This method has been
succesfully employed to study energy loss and electron emission from Al
surfaces, where the effects of the surface states were found
negligible [4]