Positronium formation in positron-noble gas collisions

Harry Walters

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Distorted-wave Born approximation calculations for Ps formation in positron impact on He, Ne, Ar, Kr and Xe are reported for the energy range up to 200 eV. Capture into the n = 1, 2 and 3 states of Ps is calculated explicitly and 1/n(3) scaling is used to estimate capture into states with n > 3. The calculations for the heavier noble gases allow for capture not only from the outer np(6) shell of the atom but also from the first inner ns(2) shell. However, the inner shell capture is found to be very small. Although by no means unambiguous, the calculations provide some support to the conjecture of Larrichia et al. [J. Phys. B 35 (2002) 2525] that the double peak and shoulder structures observed experimentally for Ps formation in Ar, Kr and Xe arise from formation in excited states. (C) 2004 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)129-133
Number of pages5
JournalNuclear Instruments & Methods in Physics Research - Section B: Beam Interactions with Materials and Atoms
Volume221
Issue number1-4
Publication statusPublished - Jul 2004

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

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