Re: [Ifeffit] S XANES question

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 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 _________________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.__gov mailto:Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.__gov/mailman/listinfo/ifeffit http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit

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