[Ifeffit] Rebinning
Kelly, Shelly D.
SKelly at anl.gov
Wed Mar 12 13:52:45 CST 2003
Hello All,
There seems to be a lot of interest in Rebinning data. I have a perl script
that
I've written to do the same thing. I thought it might be of interest.
Shelly
> -----Original Message-----
> From: Newville, Matthew G.
> Sent: Tuesday, March 11, 2003 2:08 PM
> To: Carlo.Segre at iit.edu; XAFS Analysis using Ifeffit
> Subject: Re: [Ifeffit] Rebinning
>
>
> Hi Carlo,
>
> Thanks!! That's wonderful. It seems like this should be an
> option in spline() and bkg_cl(), and possibly in pre_edge(). I
> admit to being still a little confused by the goal of the
> rebinning, especially with respect to loss of resolution. It
> seems like to use this script, you need to do two things:
> 1. select an E0. The data will be put at energies that
> will give an even k-grid with this e0. I think it's
> inevitable that if e0 changes, you might want to re-bin.
>
> 2. assume that the k-grid is small enough that the
> measurements at independent energies are within the
> acceptable energy resolution that they can be
> simply summed.
>
> Is that right?
>
> Would it be OK with you (and everyone else) to have a weighted
> average replace the boxcar average? For example, at k=12,
> [E(k+0.05) - E(k)] = 5eV, which is larger than normal energy
> resolutions, so the boxcar average might wash out the high-k
> EXAFS, no? It might be better to convolve the spectra with a
> lorenztian reflecting the incident energy resolution (probably
> defaulting to 1eV). Does that seem OK or is there something eles
> going on?
>
> Anyway, thanks!!
>
> --Matt
>
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