[Ifeffit] S XANES question

Matt Newville newville at cars.uchicago.edu
Wed Nov 26 15:32:02 CST 2014

Hi Matthew,

Could it be Pb M5?  We've seen that in a few samples.  Going above Pb M4
might help verify that or rule it out.

On Wed, Nov 26, 2014 at 2:39 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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--Matt Newville <newville at cars.uchicago.edu> 630-252-0431
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