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 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