Auger-mediated sticking of positrons to surfaces: evidence for a single-step transition from a scattering state to a surface image potential bound state

Auger-mediated sticking of positrons to surfaces: evidence for a single-step transition from a scattering state to a surface image potential bound state

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...

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Veröffentlicht in:Physical review letters 2010-06, Vol.104 (24), p.247403-247403, Article 247403
Hauptverfasser: Mukherjee, S, Nadesalingam, M P, Guagliardo, P, Sergeant, A D, Barbiellini, B, Williams, J F, Fazleev, N G, Weiss, A H
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container_end_page 247403
container_issue 24
container_start_page 247403
container_title Physical review letters
container_volume 104
creator Mukherjee, S
Nadesalingam, M P
Guagliardo, P
Sergeant, A D
Barbiellini, B
Williams, J F
Fazleev, N G
Weiss, A H
description 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.
doi_str_mv 10.1103/PhysRevLett.104.247403
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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
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