1.
Phys Rev Lett
; 88(9): 096802, 2002 Mar 04.
Artículo
en Inglés
| MEDLINE
| ID: mdl-11864040
RESUMEN
The dynamics of image-potential states on Cu(119) have been studied with two-photon photoemission. Direction-dependent quasielastic scattering processes with large momentum transfer are attributed to the finite terrace-width distribution on the stepped surface. This effectively couples image-potential states via interband scattering and leads to an asymmetry of the decay rate. Electrons in the first image-potential state live apparently longer when running upstairs.