Hi Ke,

 

Unfortunately, it looks like your data is showing the classic symptoms of self-absorption . The white line for UO2 is fairly pronounced, and should look like the attached picture.

 

Not sure on the setup at 12-BM-B, but next time ask if you could collect both fluorescence and transmission data at the same time. It can really save your behind.

 

You can dilute in whatever low Z compound you’d like, I think things like SiO2 and boron nitride are common because of their low Z. Graphite might work also. Powder smears on tape are pretty common because you can fold/unfold to vary the amount of material in the beam. (though one can’t manipulate those at the beamline with a dispersible rad powder like UO2.)

 

Best,

Drew

 

From: Ke Yuan [mailto:keyuan@umich.edu]
Sent: Thursday, October 16, 2014 8:39 AM
To: ifeffit@millenia.cars.aps.anl.gov; Latta, Drew E
Subject: Re: XAFS Analysis using Ifeffit

 

Sorry here is the picture!

 

On Thu, Oct 16, 2014 at 9:37 AM, Ke Yuan <keyuan@umich.edu> wrote:

Hello Drew,

 

Thanks for your suggestions. I just checked my original data without normalization. The edge step is about 0.7 (see pic attached). I did the measurement in fluorescence mode at APS, beamline 12-BMB. What do you think about this pic?

 

For the sample preparation, I think I need to mix UO2 with some other materials to dilute it. Do you have any suggestions on the matrix materials?

 

 

Best,

Ke

 

--

Ke Yuan

PhD Candidate

Department of Earth and Environmental Sciences
1100 North University Ave
3021 C.C Little
University of Michigan, Ann Arbor
MI 48109-1005