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

J. Lahtinen*, A. Vehanen, H. Huomo, J. Mäkinen, P. A. Huttunen, K. Rytsölä, M. Bentzon, Pekka Hautojärvi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

42 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)73-80
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number1
Publication statusPublished - 1986
MoE publication typeA1 Journal article-refereed

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