Author Topic: Sulfur Peak Shifts  (Read 5307 times)

alerner

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Re: Sulfur Peak Shifts
« Reply #15 on: February 05, 2020, 04:48:56 pm »
One additional possibility is that EPMA analysis induced redox changes in the S in glasses, so that you have an evolving peak position during measurement to some more intermediate state.

S photo-oxidation from S2- was observed by Wallace and Carmichael 1994 and Rowe et al 2007. It is less clear what happens if you have originally S6+ in glasses, as perhaps a photoreduction may occur as in X-ray synchrotron measurements (Wilke et al 2008). The integrated results of EPMA induced beam damage might be S transforming to some intermediate valence charge between the S6+ and S2-. It would be interesting to see time dependent measurements for each of these peak positions during the course of analysis, to track any peak decreases and growth over time.