[Ifeffit] o exafs

fred.mosselmans at diamond.ac.uk fred.mosselmans at diamond.ac.uk
Sat May 5 14:19:01 CDT 2018


Hi Julian,
First you'll do well to collect o k exafs to 500 evening, second exafs data is typically except on qexafs beamline collected in k space steps i.e. proportional to E squared spacing starting at the edge position. Hence 0.4 evening is a very small step for exafs NOT xanes.
If your beamline doesn't do k space scanning you can simulate it with several fixed eV step regions the step increasing as you get further from the edge. Also normally you would increase the time per point as you get further from the edge as the xafs signal compared to the background dies off
Best Regards
Fred

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Today's Topics:

   1. Energy Resolution (Julian Ehwald)


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Message: 1
Date: Sat, 5 May 2018 12:01:26 +0200
From: "Julian Ehwald" <jehwald at gmail.com>
To: "'XAFS Analysis using Ifeffit'"
 <ifeffit at millenia.cars.aps.anl.gov>
Subject: [Ifeffit] Energy Resolution
Message-ID: <000a01d3e458$086925c0$193b7140$@gmail.com>
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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

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