The gypsum spectrum looks nothing like any spectrum of gypsum or other sulfate I've ever seen.  I'm deeply suspicious.
        mam

On 11/26/2014 1:36 PM, Lyle Gordon wrote:

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 <mailto: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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