Hi Michael,
This seems like a question that others might have, so I hope
it's OK that I'm sending this reply to the ifeffit mailing
list too.
On Thu, 23 May 2002, Michael Green wrote:
> I can't figure out how to use a standard for background
> removal in G.I.FEFFIT or IFEFFIT. Is there a way to do
> this? Table 4 of the Refman lists a chi_std data type, but
> I didn't find any mention of it anywhere else.
Yes. In ifeffit, it would go like this:
####
# background-removal using known chi(k) data
read_data(file= data.xmu, label= 'energy xmu', group= dat)
read_data(file= standard.chi, label= 'k chi ', group= std)
# without standard
spline(energy= dat.energy, xmu= dat.xmu, kweight=1,rbkg=1)
# with standard
spline(energy= dat.energy, xmu= dat.xmu, kweight=1,rbkg=1,
k_std=std.k, chi_std = std.chi)
####
That is, you read in the spectra for the standard, and use it's
"k" and "chi" arrays for "k_std" and "chi_std".
Hope that helps,
--Matt
