Matthew,

Paris et al in 2001 reported higher S K-edge white line energies for SO4 in Apatite, 2 eV above Gypsum.

THE VALENCE AND SPECIATION OF SULFUR IN GLASSES

BY X-RAY ABSORPTION SPECTROSCOPY

The Canadian Mineralogist

Vol. 39, pp. 331-339 (2001)

-Lyle

On Wed, Nov 26, 2014 at 12:39 PM, Matthew Marcus <mamarcus@lbl.gov> wrote:

A user on ALS 10.3.2 is taking S K-edge XANES and consistently finding a strong peak at 2484eV (calibration: gypsum white line = 2482.75eV).
There's a shoulder at the nominal position of the sulfate peak. Now, peaks below sulfate I can understand, but since there's no such
thing as heptavalent sulfur, what could give a peak *above* the sulfate white line? Anybody ever seen that? Yes, we checked calibration.
mam
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