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
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 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
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
Hi Matthew, Lyle,
I'm still learning S XANES, but when we've measured gypsum, it looks very
comparable to the spectra from ID21:
http://www.esrf.eu/UsersAndScience/Experiments/Imaging/ID21/php/gypsum
We often use the spectra from there as references (or when asking: Is this
standard what we
Yup, that's what mine looks like, if done with TEY to avoid overabsorption.
For calibration, I use FY and take the peak position as
the calibration. Yours also looks tolerably like the apatite spectrum in the
cited paper (copied here:
