[Ifeffit] [HOWTO] converting experimental mu(E) in cm^-1

[Tsu-Chien Weng]

Hi Mauro,

> I would like your opinion on the procedure to convert the experimental
> mu_exp(E) in arbitrary units (counts) to mu(E) in cm^-1.
>
> Does it already exist a software that makes this work automatically? 
> Could
> be interesting to implement it in Athena?

Here is our approach for normalization:

mu_th = S*mu_exp + Bkg

where S is the scaling factor and Bkg is the background function (both 
pre- and post-edge).  In addition to polynomials, an erfc() are used to 
account for the scattering leaking into the fluorescence window.  This 
normalization scheme gives us fairly good results for a series of data 
with changes one XANES.

If you like, I can send you my codes (in MATLAB) and the manuscript 
(written 3 years ago for JSR, but got frozen on someone's desk).

Tsu-Chien
<Chien>001000</Chien>