The role of vibrational doorway states in positron annihilation with large molecules

G. F. Gribakin, P.M.W. Gill

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Positron annihilation rates in many polyatomic molecular gases are anomalously high. Qualitatively, this can be explained by positron capture in vibrational Feshbach resonances, which can occur for molecules with positive positron a?nities [Gribakin, Phys. Rev. A 61 (2000) 022720]. To verify this idea quantitatively, we examine the densities of vibrational excitation spectra of alkanes. To understand the energy dependence of the annihilation rates for alkanes, we propose that positron capture is mediated by vibrational doorway states, in which positron binding is accompanied by the excitation of fundamentals.
Original languageEnglish
Pages (from-to)30-35
Number of pages6
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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