[Ifeffit] Find white line position
segre at iit.edu
Thu Aug 2 09:48:02 CDT 2018
You are probably better off putting a bit more time into the analysis and
simply fitting with an arctangent and a gaussian to get the white line
On Thu, 2 Aug 2018, Bruce Ravel wrote:
> It's not very sophisticated.
> Starting with the "flattened" spectrum (see
> it simply finds the highest point in the spectrum. Literally just the
> ceiling function.
> The flattened spectrum is used rather than the normalized spectrum because
> the curvature of the post-edge (or even the curvature of the pre-edge in
> fluorescence data with a energy dispersive detector) could result in other
> regions being higher in value than the white line.
> This is a pretty horrible algorithm. It is, I think, guaranteed to find an
> obviously wrong point for a metal. Basically it works for spectra with a
> white line and it will almost certainly fail for spectra without a white
> Use with caution!
> On 08/02/2018 01:28 AM, Hiroshi OJI wrote:
>> Dear all,
>> I have a question about one of the useful function, "find white line
>> position" in Athena.
>> Could anyone tell me how Athena find the white line position by this
>> function? In other words, I would like to know the algorithm to find the
>> white line position in Athena.
>> Thank you very much for your help, in advance.
>> Best regards,
>> Hiroshi Oji
Carlo U. Segre -- Duchossois Leadership Professor of Physics
Interim Chair, Department of Chemistry
Director, Center for Synchrotron Radiation Research and Instrumentation
Illinois Institute of Technology
Voice: 312.567.3498 Fax: 312.567.3494
segre at iit.edu http://phys.iit.edu/~segre segre at debian.org
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