[Ifeffit] S XANES question

[Lyle Gordon]

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 at 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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