[Ifeffit] status of self-absorption corrections

mauro at rulp.org mauro at rulp.org
Fri Apr 30 04:32:16 CDT 2004

Hi to all,

I would like to ask you which is the status of the discussion on the
self-absorption corrections to fluorescence EXAFS.

I'm working on Mo/Si multilayers, studied by standing-wave-assisted EXAFS.
My data are collected at grazing incidence (phi + theta = 90 deg) with a Ge
(13 elements) detector. I have done data analysis without self-absorption
corrections and I have found good results, except for the amplitude (S_0^2)
that is very low (~0.50). I think this low value is due to self-absorption,
so I would like to demonstrate it.

My dilemma is: Troger's approach or Booth's one?

I personally think that Booth's (simple) approach, could be used in this
particular case (Ge detector, phi+theta=90deg), but my tutor told me that I
can't assume a neglectable solid angle for a Ge detector so I have to use
the Troeger's (quite difficult) approach. 

>From the mailing-list archive, I have read your discussion about this topic
but I haven't found something like a "conclusion". Is there anyone who use
Booth's approach with good results? Have you already done "tests" of this
method? Is it possible to improve it?

Finally, what about the software status? Matt, have you done something on
Booth's Fortran code?


  Mauro Rovezzi <mauro at rulp.org> - Physics student
  University of Rome "Tor Vergata", ESRF Beamline BM8 - GILDA 

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