High-intensity variable-energy positron beam for surface and near-surface studies

Tutkimustuotos: Lehtiartikkeli

Tutkijat

  • Jouko Lahtinen

  • A. Vehanen
  • H. Huomo
  • J. Mäkinen
  • P. A. Huttunen
  • K. Rytsölä
  • M. Bentzon
  • Pekka Hautojärvi

Organisaatiot

  • Aalto University

Kuvaus

We report on the construction and performance of a magnetically confined slow positron beam. The beam is designed for surface physics and near-surface disorder studies and it operates in ultrahigh vacuum with a base pressure of 3 nPa. The beam uses a Co-58 source with a backscattering W(110) single crystal moderator. We get 4.7 × 106 slow positrons per second striking the sample using a 300 mCi source corresponding to a fast-to-slow positron conversion efficiency 0.28 ± 0.02%. The energy of the incident positrons can be varied from 1 eV to 35 keV. Some applications concerning positron re-emission and diffusion as well as positronium desorption from a surface state are shown.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut73-80
Sivumäärä8
JulkaisuNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Vuosikerta17
Numero1
TilaJulkaistu - 1986
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 17236085