[Ifeffit] something is wrong with Ruthenium-Oxygen bond amplitudes

[Scott Calvin]

Hi Maria,

What was the physical form of the samples (powder, thin film, etc.)  
and how were they measured (transmission, fluorescence, ...)?  
Sometimes this kind of thing can stem from sample/beamline/data effects.

--Scott Calvin
Sarah Lawrence College

On Nov 5, 2010, at 5:50 PM, María Elena Montero Cabrera wrote:

> Hello friends,
>
> Hopping someone could help us. We are having some problems in  
> fitting Ru K-edge in a Ruthenium-cuprate sample on Artemis, with  
> path functions obtained using FEFF 8.4, where we got amplitude  
> values of less than 0.50 for Ru-O first shells. We think this value  
> probably is wrong, although there are some publications where some  
> oxygen deficiency is studied and recorded as true. The ATOMS input  
> data was found to be ok due to the Rietveld analysis results told us  
> these are good. The reason we think we may be wrong with something  
> during the fitting appeared  because we tried to fit our reference  
> sample of RuO2 (measured under same conditions as the experiment of  
> Ru-Cu at SSRL) and we came to the same results, even worst, of  
> amplitude lower than 0.40. We are attaching the Artemis files so you  
> can take a look on it and give us some light to continue with our  
> analysis.
> Thanking in advance, take care