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Iterative energy self-calibration of Fe XANES spectra. Erratum

aInstitute for Future Environments, Central Analytical Research Facility, Queensland University of Technology, Brisbane, Australia, bResearch School of Earth Sciences, Australian National University, Canberra, Australia, cANSTO Australian Synchrotron, Clayton, Australia, and dSchool of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, Australia
*Correspondence e-mail: mw.jones@qut.edu.au

Edited by R. W. Strange, University of Essex, UK (Received 19 June 2020; accepted 19 June 2020)

In the paper by Jones et al. (2020[Jones, M. W. M., Mallmann, G., Wykes, J. L., Knafelc, J., Bryan, S. E. & Howard, D. L. (2020). J. Synchrotron Rad. 27, 207-211.]), the authors have noted that an incorrect value was published for the calibrated Fe3+/ΣFe for the rafted pumice sample from the 2012 Havre eruption. The correct value is 0.257 (0.010) and is included in the updated Table 2[link] below and updated in the inset in Fig. 3(c)[link] (overleaf).

Table 2
Summary of uncalibrated and self-calibrated values for the data presented in Fig. 3[link], where the uncalibrated, self-calibrated and expected Fe3+/ΣFe ratios are presented together with the required energy change (ΔE)

  Fe3+/ΣFe  
Sample Uncalibrated Self-calibrated Expected ΔE (eV)
MORB VG3450 0.591 (0.018) 0.129 (0.004) 0.132 0.8
RGM-2 0.535 (0.037) 0.231 (0.016) 0.262 (0.015) 0.3§
Havre pumice 0.452 (0.031) 0.257 (0.010) 0.5§
†Manually offset to be within calibration range.
‡RGM-1 values.
§After manual offset.
[Figure 3]
Figure 3
Demonstration of iterative energy calibration correction. (a) A MORB glass spectra (Smithsonian Institute sample number VG 3450), as collected by Berry et al. (2018[Berry, A. J., Stewart, G. A., O'Neill, H. St C., Mallmann, G. & Mosselmans, J. F. W. (2018). Earth Planet. Sci. Lett. 483, 114-123.]) (orange dot–dashed line), iteratively self-corrected (solid black line) to the basaltic glass standards. Also shown for reference are the spectra for the 0.011 and 0.775 Fe3+/ΣFe ratio standards (black dotted lines). The Fe3+/ΣFe ratio (inset) for Method A (solid orange lines) and B (dashed blue lines) as a function of iteration number shows convergence to a single Fe3+/ΣFe ratio. Similar treatment is shown for the RGM-2 reference standard (b) and an experimental section of pumice from the 2012 Havre eruption (c), both iteratively self-corrected to the rhyolite glass standards (Cottrell et al., 2009[Cottrell, E., Kelley, K. A., Lanzirotti, A. & Fischer, R. A. (2009). Chem. Geol. 268, 167-179.]). Also shown for reference are the spectra for the 0.238 and 0.806 Fe3+/ΣFe ratio standards (black dotted lines). The vertical dashed lines in (a)–(c) refer to the two points E1 and E2 in each case.

References

First citationBerry, A. J., Stewart, G. A., O'Neill, H. St C., Mallmann, G. & Mosselmans, J. F. W. (2018). Earth Planet. Sci. Lett. 483, 114–123.  Web of Science CrossRef CAS Google Scholar
First citationCottrell, E., Kelley, K. A., Lanzirotti, A. & Fischer, R. A. (2009). Chem. Geol. 268, 167–179.  Web of Science CrossRef CAS Google Scholar
First citationJones, M. W. M., Mallmann, G., Wykes, J. L., Knafelc, J., Bryan, S. E. & Howard, D. L. (2020). J. Synchrotron Rad. 27, 207–211.  CrossRef CAS IUCr Journals Google Scholar

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ISSN: 1600-5775
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