Seminarios del IFLP y del Departamento

SEMINARIOS  DEL IFLP y DEL DEPARTAMENTO

Martes  17 de junio, 11hs – AULA CHICA

TÍTULO: "New insights into the mechanism of electrons' stripping from ions interacting with crystalline solids"

EXPOSITOR: Prof. David Martín y Marero

Departamento de Física Aplicada, Facultad de Ciencias Universidad Autónoma de Madrid

Resumen: When an ion impinges on a solid, it rapidly undergoes a process in which its electrons are stripped away, provided the velocity of the orbiting electrons is smaller than the projectile speed. Electron stripping determines any posterior behavior of the ions in the solid, and it is assumed that it takes place on the surface of the solid, but no information is available on the details of this process. Here we show, using the Coulomb explosion of C2+ ions moving in Si as a
tool, that electron stripping takes place in an orderly manner and that the number of electrons stripped, before charge equilibration, depends on a characteristic length. We also propose a relation capable of quantifying this dependence. We foresee these results as a starting point to a more general understanding of ion-solid interaction, with important consequences on ion beam analysis and
modification techniques.

Lugar: Aula Chica del Departamento de Física de la Facultad de Ciencias Exactas;
calle 49 y 115

Contacto: manias@fisica.unlp.edu.ar