Dear all, We are looking for a beamline scientist with a focus on our X-ray emission spectrometer at the ACT station, CAT-ACT beamline at the KIT Light Source, Germany. Please note that the position is initially for two years; however, we are strongly committed to extending it and offering a long-term perspective. https://www.pse.kit.edu/english/karriere/joboffer.php?id=164749 Unlike a classical user operation, the beamline scientist will support our own projects and collaborative projects. Thank you for applying or forwarding the opening to suitable candidates. All the best, Tonya Vitova -----Original Message----- From: ifeffit-request@millenia.cars.aps.anl.gov Sent: Freitag, 31. Januar 2025 07:00 To: ifeffit@millenia.cars.aps.anl.gov Subject: Ifeffit Digest, Vol 275, Issue 6 Send Ifeffit mailing list submissions to ifeffit@millenia.cars.aps.anl.gov To subscribe or unsubscribe 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. Help with constrains (Otal Eugenio) 2. Re: Help with constrains (Matt Newville) ---------------------------------------------------------------------- Message: 1 Date: Thu, 30 Jan 2025 18:48:18 +0900 From: Otal Eugenio Subject: [Ifeffit] Help with constrains To: XAFS Analysis using Ifeffit Message-ID: Content-Type: multipart/alternative; boundary="00000000000088cc25062ce95500" Hi all, I am experiencing an issue with CN and sigma2, which are correlated. My CN value is too high, and I would like to reduce it to see if I can improve the fit. I have three questions: 1. Are constraints a viable option? If not, could you clarify the alternatives? 2. The examples I found are in Python, but I am using the GUI. How should I correctly define a constraint? GPT suggested the following: max(4, 12 * exp(-sigma2_O232 / 0.02)), is it correct? 3. I attempted to apply this constraint, but now I cannot delete it. Restarting Larch for each value is not a practical solution. How can I modidy the constraint efficiently? Thank you for your help! Best regards,