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 <mamar...@lbl.gov
<mailto:mamar...@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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