[Ifeffit] Advice on using Athena for XANES LCF on spectra with a small edge step?

Mike Massey mmassey at gmail.com
Tue Jan 15 18:39:40 CST 2019

Thanks for the response!

I should clarify, the data are collected in fluorescence, concentration is perhaps in the hundreds of ppm to tenths-of-percent range in this case.

Personally I haven't had great luck with self-absorption correction in the past (actually I've had basically no luck), so for concentrated samples I generally follow Scott Calvin's "cut twice, measure once" rule and that has been helpful. When the concentrations get _too low_ though, it seems that I run into this problem...



> On Jan 15, 2019, at 4:31 PM, "daltonabdala at gmail.com" <daltonabdala at gmail.com> wrote:
> Hello, Mike et al., 
> you can correct for self-absorption using the "self-absorption correction tool" in Athena, as long as the chemical composition of your sample is known.
> In case it's not possible to determine the chemical composition of you sample, and your sample is conductive, then running your experiment in total electron yield (TEY) mode would be an alternative.
> If you're sample isn't suitable for TEY, and the only choice you have left is to run it in fluorescence mode, then you should dilute your sample to a total concentration of P of ~ 0.1 - 0.15% to avoid self-absorption.
> It's very important to think through your experiment/samples before you get to the beamline as it avoids you running into such issues, saving you a lot of time. 
> Hope it helps ;)
>  - Dalton Abdala
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