title: Auger-mediated sticking of positrons to surfaces: evidence for a single-step transition from a scattering state to a surface image potential bound state.
abstract: We present the observation of an efficient mechanism for positron sticking to surfaces termed here Auger-mediated sticking. In this process the energy associated with the positrons transition from an unbound scattering state to a bound image potential state is coupled to a valence electron which can then have sufficient energy to leave the surface. Compelling evidence for this mechanism is found in a narrow secondary electron peak observed at incident positron kinetic energies well below the electron work function.
authors.affiliation: Department of Physics, University of Texas at Arlington, Arlington, Texas 76019, USA.
authors.forename: S
authors.initials: S
authors.lastname: Mukherjee
authors.forename: M P
authors.initials: MP
authors.lastname: Nadesalingam
authors.forename: P
authors.initials: P
authors.lastname: Guagliardo
authors.forename: A D
authors.initials: AD
authors.lastname: Sergeant
authors.forename: B
authors.initials: B
authors.lastname: Barbiellini
authors.forename: J F
authors.initials: JF
authors.lastname: Williams
authors.forename: N G
authors.initials: NG
authors.lastname: Fazleev
authors.forename: A H
authors.initials: AH
authors.lastname: Weiss