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 Sent from BlueMailhttp://www.bluemail.me/r?b=12874 On 5 May 2018, at 18:02, ifeffit-request@millenia.cars.aps.anl.govmailto:ifeffit-request@millenia.cars.aps.anl.gov wrote: Send Ifeffit mailing list submissions to ifeffit@millenia.cars.aps.anl.gov To subscribe or unsubscribe via the World Wide Web, visit http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit or, via email, send a message with subject or body 'help' to ifeffit-request@millenia.cars.aps.anl.gov You can reach the person managing the list at ifeffit-owner@millenia.cars.aps.anl.gov When replying, please edit your Subject line so it is more specific than "Re: Contents of Ifeffit digest..." Today's Topics: 1. Energy Resolution (Julian Ehwald) ________________________________ Message: 1 Date: Sat, 5 May 2018 12:01:26 +0200 From: "Julian Ehwald" To: "'XAFS Analysis using Ifeffit'" Subject: [Ifeffit] Energy Resolution Message-ID: <000a01d3e458$086925c0$193b7140$@gmail.com> Content-Type: text/plain; charset="us-ascii" 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