[Ifeffit] Energy Resolution

Carlo Segre segre at iit.edu
Sat May 5 18:07:12 CDT 2018

Hi Julian:

With an edge energy of 543 eV, your monochromator resolution should be at 
least 0.1 eV.  If you are interested in XANES, you need to take data at 
this resolution or maybe even better.  ONce past the edge, there is no 
need to keep that step size.  If your beamline permits an EXAFS-type step 
scan with steps in k-space, you want to use a dk of 0.05 which is what 
IFEFFIT interpolates to.  Smaller step sizes are not really useful.


On Sat, 5 May 2018, Julian Ehwald wrote:

> Dear all,
> This might be a very general question, but: I was wondering what energy
> resolution you typically use at beamlines to obtain your raw data for exafs.
> Since we have limited Beamtime only and other experiments that we want to
> carry out, I was wondering what kind of resolution is common. Or
> differently: Is it predictable what happens if I for example change from
> steps of 0.2eV to 0.4eV? We want to obtain spectra up to 500eV above Oxygen
> K, if that is of relevance.
> Best, Julian

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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