title: The attenuation length of low energy electrons in Yb.
abstract: Photoelectron emission spectra in a photon energy range between 7.5 and 21 eV are measured for in situ grown polycrystalline Yb films. By comparing bulk and surface core level shifted 4f components we give an estimation of the effective attenuation length (EAL) for low energy (6-20 eV) electrons in Yb, establishing a moderate increase of the EAL upon electron energy decrease. The experimental EAL data are found to be a factor of four smaller than those predicted from the so-called 'universal curve'.
authors.affiliation: CNISM and Dipartimento di Fisica, Università Roma Tre, Rome, Italy. offi@fis.uniroma3.it
authors.forename: F
authors.initials: F
authors.lastname: Offi
authors.forename: S
authors.initials: S
authors.lastname: Iacobucci
authors.forename: L
authors.initials: L
authors.lastname: Petaccia
authors.forename: S
authors.initials: S
authors.lastname: Gorovikov
authors.forename: P
authors.initials: P
authors.lastname: Vilmercati
authors.forename: A
authors.initials: A
authors.lastname: Rizzo
authors.forename: A
authors.initials: A
authors.lastname: Ruocco
authors.forename: A
authors.initials: A
authors.lastname: Goldoni
authors.forename: G
authors.initials: G
authors.lastname: Stefani
authors.forename: G
authors.initials: G
authors.lastname: Panaccione