Positron annihilation lifetime spectroscopy source correction determination: A simulation study

Gurmeet S. Kanda, David J. Keeble (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Positron annihilation lifetime spectroscopy (PALS) can provide sensitive detection and identification of vacancy-related point defects in materials. These measurements are normally performed using a positron source supported, and enclosed by, a thin foil. Annihilation events from this source arrangement must be quantified and are normally subtracted from the spectrum before analysis of the material lifetime components proceeds. Here simulated PALS spectra reproducing source correction evaluation experiments have been systematically fitted and analysed using the packages PALSfit and MELT. Simulations were performed assuming a single lifetime material, and for a material with two lifetime components. Source correction terms representing a directly deposited source and various foil supported sources were added. It is shown that in principle these source terms can be extracted from suitably designed experiments, but that fitting a number of independent, nominally identical, spectra is recommended.
Original languageEnglish
Pages (from-to)54-59
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, A
Volume808
Early online date19 Nov 2015
DOIs
Publication statusPublished - 1 Feb 2016

Keywords

  • Positron annihilation lifetime spectroscopy
  • Multiexponential decays
  • Deconvolution

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