Hello Joyti, I'm not sure I know what your definition of 'exact' and 'average'. The exafs signal comes from each atom that is probed by the x-ray beam. The total signal is exactly an average of the local atomic environment of all atoms. If half the atoms have 4 carbon neighbors and the other half have 8 carbon neighbors at the same distance, the exafs signal will be that of 6 carbon neighbors. Kind regards Shelly ________________________________ From: Ifeffit on behalf of Anatoly Frenkel Sent: Monday, April 24, 2023, 11:06 AM To: XAFS Analysis using Ifeffit Subject: Re: [Ifeffit] (no subject) Joyti, The coordination number of Rh-C bonds is defined as the total number of Rh-C bonds in the sample divided by the total number of Rh atoms in the sample. Anatoly ------------------------------------------------------------------- Anatoly I. Frenkel Professor Department of Materials Science and Chemical Engineering (primary appointment) Department of Chemistry (affiliate appointment) Stony Brook University Stony Brook, NY 11794 Email: anatoly.frenkel@stonybrook.eduhttps://mail.bnl.gov/OWA/redir.aspx?C=F6wCGt4adziN6IvpdRQ-rWdgy3Oaoif_x-0ybKTBGBlALcrWeszTCA..&URL=mailto%3ajgchen%40columbia.edu http://you.stonybrook.edu/frenkel Co-Director and Spokesperson, Synchrotron Catalysis Consortium (SCC) at BNL http://you.stonybrook.edu/scc2 Joint Appointment: Senior Chemist Chemistry Division, Brookhaven National Laboratory Upton, NY 11973. Ph: 631-344-3013. Group: 631-344-3494 Email: frenkel@bnl.govmailto:frenkel@bnl.gov https://www.bnl.gov/staff/frenkel ------------------------------------------------------------------- On Mon, Apr 24, 2023 at 12:25 PM Jyoti Pandey mailto:jyotipandey51092@gmail.com> wrote: Hello everyone, I have a cluster of 13 Rh atoms above the graphene sheet. The first coordination number that I am getting is around 1.65 (which is obtained by choosing a Rh-C) path. I am curious to know whether this value is the "exact" or the "average" coordination number w.r.t all the Rh atoms. Thanks With Best Regards Dr. Jyoti Pandey, Ph.D. Postdoctoral Researcher Department of Physics Central Michigan University, MI, USA Mobile No. +1-928-265-0599 ..................................... _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.govmailto:Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit