I'm assuming that the desire is to measure the EXAFS of the UO2, not the SrTiO3
substratem right?
The ratio of the signal from the SrTiO3 to the UO2 would depend on the
thickness of the UO2 and the incidence and takeoff angle
(assuming you do fluorescence). There shouldn't be much interference with the
EXAFS signal from the substrate because you're
a keV away, so the EXAFS from the substrate will be substatially damped and
will show up as slowly-varying background. The real issue
will be if the fluorescence from the Sr swamps that of the U. The fluorescence
energies are pretty close. Some things to try include
going to grazing exit or incidence, depending on the film thickness, and doing
the measurement in electron yield, which won't see much
of the substrate.
mam
On 11/16/2010 2:16 PM, María Elena Montero Cabrera wrote:
Dear Mohamed,
I think you will have some kind of "over" or "self" -absorption from the substrate,
specially in geometries other than grazing incidence. I have performed that kind of experiments in
fluorescence and in transmission. The result was that the absorption coefficient signal I was interested in,
really was of 2nd or 3rd order of magnitud less that the "tail" of absorption of the substrate. I
would not do that again. Maybe somebody has better experience.
Regards
Maria Elena
2010/11/16 mohamed sobhy <bakhshwan1...@yahoo.com
<mailto:bakhshwan1...@yahoo.com>>
Dear All
I would like to grow UO2 thin films on STO (SrTiO3) substrate but I found
that Sr K-edge 16105 and U L3-edge is 17166. Do you think there will be any
interference?
Best,
Mohamed
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María Elena
Dra. María Elena Montero Cabrera
Centro de Investigación en Materiales Avanzados (CIMAV)
Miguel de Cervantes 120, Compl. Ind. Chihuahua
Chihuahua CP 31109, Chih. México
Tel (614) 4391123
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