Re: [Ifeffit] edge height proportional to the molar density?

25 Jul 2009

      Hi Haiyan,

Yes, relative concentrations for different elements within the same
sample can be estimated from edge jumps. Be sure to normalize by the
difference in absorption coefficient for each edge--you can get those
figures from Hephaestus, among other places.

This method won't be as accurate as techniques like ICP or XRF,
largely because it's hard to normalize XAS spectra consistently
between different edges. But you can easily do better than 20% accuracy.

--Scott Calvin
Sarah Lawrence College

On Jul 24, 2009, at 5:16 PM, Haiyan Zhao wrote:
...
I am wondering whether the edge height could be used to estimate
molar density or not. If so, is there any reference about such kind
of calculation? Thanks!
Haiyan
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