[Ifeffit] continuous scan data

Carlo U. Segre segre at iit.edu
Thu Jul 18 02:27:36 CDT 2002

On Wed, 17 Jul 2002, Bruce Ravel wrote:

>  CS> What is done with the high density data when converting to
>  CS> k-space?  Do you rebin (averaging both E and mu data) or do you
>  CS> use a smoothing fit to take advantage of the statistics present
>  CS> in the excess data points, or do you just interpolate and throw
>  CS> away the extra statistics?
> I think I answered this above.  I suppose you might say that ifeffit
> "interpolates and throws", but even that depends on what advantage you
> claim to be getting by measuring on a finer grid.  There are physical
> limits to the resolution, so in that sense a finer grid does not help.
> However, mesuring for one second per point on, say, a 0.25 eV grid is
> similar in a counting statistics sense to two measurements of one
> second per point on a 0.5 eV grid.  That counting statistics
> improvement is not lost in the interpolation of chi(E) to chi(k).

I think that this last sentence is the answer that I was looking for.  I
wanted to know if the counting statistics improvement is propagated in the
transformation to k-space.  This is good since it means that we do not
have to write our own rebinning or smoothing routines before handing the
data off to athena and ifeffit.


Carlo U. Segre -- Professor of Physics
Illinois Institute of Technology
Voice: 312.567.3498            Fax: 312.567.3494
Carlo.Segre at iit.edu    http://www.iit.edu/~segre

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