Quantification of Olivine Using Fe Lα in Electron Probe Microanalysis (EPMA)

Ben Buse*, Stuart Kearns

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)
255 Downloads (Pure)

Abstract

Quantification of first series transition metal Lα X-rays is hampered by absorption and in some cases transition probabilities (fluorescence yields) varying with chemical bonding. Compound mass absorption coefficients for Fe Lα were measured in the olivine solid solution series [Forsterite (Mg2SiO4) to Fayalite (Fe2SiO4)] and the mass absorption coefficients for Fe Lα absorbed by Fe were calculated. The mass absorption coefficients vary systematically between Fo83 and Fo0. Using the measured mass absorption coefficients for both standard and unknown and by correcting for a systematic discrepancy, consistent with varying partial fluorescence yields, a good agreement between calculated k-ratios and measured k-ratios is achieved. The systematic variations allow quantification of unknown k-ratios. The described method of quantification requires modification of matrix correction routines to allow standards and unknowns to have different mass absorption coefficients, and to incorporate solid solution mass absorption coefficients and partial fluorescence yield corrections derived from regression of experimental data.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalMicroscopy and Microanalysis
Volume24
Issue number1
DOIs
Publication statusPublished - 27 Feb 2018

Keywords

  • electron probe microanalysis
  • L-line X-rays
  • low voltage
  • mass absorption coefficients
  • olivine

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