[Ifeffit] SO2 for samples with non-planar geometry

[Joel Brugger]

Dear list,

We are trying to fit EXAFS from data collected on solutions within a capillary. The capillary has OD 1mm, ID 0.8mm, and was placed horizontally. The beam is 1x2 mm (VxH).

Fitting the copper reference foil, we get the expected SO2 value of ~0.7.

However, the solution containing the Cu(II) aqua ion gives a coordination of 2, instead of the expected 5-6. So our SO2 for this solution is apparently ~0.25. 

I couldn’t find a discussion of the effect of geometry (in our case cylindrical rather than planar) on SO2. Is it possible that the low SO2 is a result of the odd geometry?

Confused as ever,

JOEL


Joël Brugger
Professor of Synchrotron Geosciences

Monash University
School of Earth, Atmosphere and Environment 
Room 257A, Level 2, 9 Rainforest Walk <x-apple-data-detectors://2>
Clayton, Victoria 3800 <x-apple-data-detectors://2>
Australia <x-apple-data-detectors://2>

T: +61 3 9905 4898 <tel:+61%203%209902%209095>
E: Joel.Brugger at monash.edu <mailto:Andrew.Mackintosh at monash.edu> 
Twitter: @JoelBrugger

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