[Ifeffit] How does AUTOBK handle the pre-edge background removal?

[Matt Newville]

Hi Yu-Chuan,

Autobk uses a linear fit to the pre-edge region, and subtracts 
that line from the full spectra. More details are at
  http://cars9.uchicago.edu/autobk/ProgramDoc/node14.html

Ifeffit's spline() command and Athena do the same thing.  The 
range of the pre-edge used for the linear fit can be adjusted.
Athena allows you to view the pre-edge line very easily.

--Matt

On Tue, 11 Jan 2005 hsnuboy at ksu.edu wrote:

> 
> Dear Ifeffit list,
> 
>     There is one question I don't understand very well. How does AUTOBK
> algorithm handle the pre-edge background removal? I check the mannual
> of using ATHENA and the paper, "Near-edge x-ray-absorption fine
> strructure of Pb: A comparison of theory and experiment", M. Newville,
> et al., Phys. Rev., B47:21 (1993), 14126. Both of them have no
> information about dealing pre-edge background removal with AutoBK and
> how is it work within Athena? Hence, I ask this qustion for all the
> experts on the list. Thank you for your help.
> 
> Sincerely,
> 
> Yu-Chuan Lin
> Research Assistant
> Dept. of Chemical Engineering
> Kansas State University
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