December 2017 - Ifeffit - millenia.cars.aps.anl.gov

Re: [Ifeffit] Ifeffit Digest, Vol 169, Issue 9
by Abhinav Prabhakar 05 Aug '20

05 Aug '20

Hello, Thank you for your reply. Attached is the CIF file in question. The crystal is Tobermorite 14A, taken from COD website. However, the structure has partial occupancy and it is modified to include full occupancy. The modified CIF file shows a space group of B11b (and cannot be recognized by Artemis). I tried a C1c1 space group (it works) but it shows the same structural values as a P11b. Regards, AP On Tue, Mar 14, 2017 at 1:00 AM, <ifeffit-request(a)millenia.cars.aps.anl.gov> wrote: > Send Ifeffit mailing list submissions to > ifeffit(a)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(a)millenia.cars.aps.anl.gov > > You can reach the person managing the list at > ifeffit-owner(a)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. Re: Space group type in Artemis (Bruce Ravel) > 2. Data export and coordination number (Abhinav Prabhakar) > 3. Re: Data export and coordination number (Bruce Ravel) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 13 Mar 2017 09:20:14 -0400 > From: Bruce Ravel <bravel(a)bnl.gov> > To: XAFS Analysis using Ifeffit <ifeffit(a)millenia.cars.aps.anl.gov> > Subject: Re: [Ifeffit] Space group type in Artemis > Message-ID: <3853f1f7-61fd-6886-306f-040c540ecae1(a)bnl.gov> > Content-Type: text/plain; charset=windows-1252; format=flowed > > On 03/11/2017 05:56 AM, Abhinav Prabhakar wrote: > > Hello, > > > > I have a question about the working of Artemis as a new user. > > > > Artemis does not recognize the space group B11b. When importing a cif > > file of a crystal with this symmetry, it sends a prompt message that the > > space group symbol cannot be recognized. As a result, I changed it to > > P11b and it works. But would this change any crystal information (for > > eg. Degen, Reff values) significantly? > > I am not a crystallography expert in any sense. When I wrote Artemis, I > meticulously followed what I found in the fourth edition of the > International Tables for Crystallography, Volume A. Every symbol > defined in there is recognized by Artemis. (Well, I guess I should say > that every symbol is /supposed to be/ recognized by Artemis. If one is > missing, that's a bug and should be reported.) > > "B11b" is not a symbol that I found in my copy of ITC volume A. As > Robert suggested, there may be a way to rotate group 9 so that "B11b" is > an interpretable symbol in the abstract. But Artemis does not know how > to do that. (Nor do I.) > > "P11b" is a setting for space group #7. If, as Robert suggests, your > CIF file is for space group #9, then the answer to your last question is > yes. It is plainly obvious that using a different space group will > change the degeneracies and distances. > > > Of course, you did not bother to include a copy of the CIF file in > question to your original email, so it is not actually possible for > Robert or I or anyone else to actually help you effectively. > > At the risk of sounding like an annoyingly broken record, everyone > should take the time to ask a good question or write an actionable bug > report: > > http://bruceravel.github.io/demeter/documents/SinglePage/help.html > http://bruceravel.github.io/demeter/documents/SinglePage/bugs.html > > B > > > -- > Bruce Ravel ------------------------------------ bravel(a)bnl.gov > > National Institute of Standards and Technology > Synchrotron Science Group at NSLS-II > Building 743, Room 114 > Upton NY, 11973 > > Homepage: http://bruceravel.github.io/home/ > Software: https://github.com/bruceravel > Demeter: http://bruceravel.github.io/demeter/ > > > ------------------------------ > > Message: 2 > Date: Mon, 13 Mar 2017 21:48:31 +0800 > From: Abhinav Prabhakar <abhi.prabhakar(a)gmail.com> > To: ifeffit(a)millenia.cars.aps.anl.gov > Subject: [Ifeffit] Data export and coordination number > Message-ID: > <CA+nbL85FJReunY1Am1oeNTMtFskXMd8FmH_OgaO00mnmew2c-g(a)mail.gmail. > com> > Content-Type: text/plain; charset="utf-8" > > Hello, > > As a new user, I have some questions related to the use of Athena and > Artemis: > > i) Is it possible to extract the normalized/background corrected data from > Athena (in E-,k- and R- space) and export it as numbers (to Excel perhaps)? > > ii) Using Artemis, how can coordination numbers (N) be expressed as 'guess' > parameters (Artemis allows only numerical values for N)? > > Thank you. > > Regards, > > Abhinav Prabhakar (Mr.) >

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XAFS short course in BNL: Nov 1-3, 2017
by Anatoly Frenkel 08 Feb '18

08 Feb '18

Dear subscribers: Please share with your group members or others, who may be interested, the following information about the short course on XAFS spectroscopy: Title: *Data Analysis and Modeling of XANES and EXAFS Spectra. Applications to Nanomaterials* Dates: *November 1-3, 2017* Location: *Brookhaven National Laboratory* The course is open for applications at this web site: https://www.bnl.gov/exafs2017/ <https://mail.bnl.gov/OWA/redir.aspx?C=Cs5LzjKsiYS2QXnknBXt0VXGF6SSe4a5Kclqc…> The course will be useful for those scientists who are familiar with the foundations of XAFS experiment, theory and data analysis, and seek training in advanced methods. The course will include lectures, software demonstrations, and data analysis sessions. The emphasis will be on applications of XAFS to nanomaterials but we will welcome all participants who are interested in modern analysis methods. The course instructors will use examples from their research during presentations. The topics covered will include: -Theory of XANES, -XANES data analysis, -Structural refinement using XANES, with emphasis on the following methods: -Molecular dynamics, -Reverse Monte Carlo. -Machine Learning methods During the data analysis practicum on November 3, participants will get an opportunity to work with research projects with the help of the course instructors. The course is co-sponsored by BNL and Synchrotron Catalysis Consortium (SCC). Best regards, Anatoly ------------------------------------------------------------------- Anatoly I. Frenkel Professor Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook, NY 11794, Ph: 631-632-2751 Email: anatoly.frenkel(a)stonybrook.edu <https://mail.bnl.gov/OWA/redir.aspx?C=F6wCGt4adziN6IvpdRQ-rWdgy3Oaoif_x-0yb…> http://you.stonybrook.edu/frenkel Joint Appointment: Chemistry Department, Brookhaven National Laboratory Upton, NY 11973. Ph: 631-344-3013. Group: 631-344-3494 Email: frenkel(a)bnl.gov https://www.bnl.gov/chemistry/bio/FrenkelAnatoly.asp Spokesperson, Synchrotron Catalysis Consortium (SCC) at BNL http://you.stonybrook.edu/scc2 -------------------------------------------------------------------

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data table for larch data group
by Bruce Ravel 22 Dec '17

22 Dec '17

Matt, If I read an ascii file with read_ascii() like so: a = read_ascii(file) The "a" group has a data attribute which contains the entire data table as a 2D array. It also has 1D arrays for each column from the data table. Those 1D arrays have attribute names taken from the column labels. If I do something to change the data table, is there a function that I can call that repopulates the 1D arrays with the columns of the altered data table? For example: a = read_ascii(file) a.data is, say, array<shape=(5,500)> a.data = a.data[:, (0 .. 10)] now a.data is, say, array<shape=(5,11)> a.repopulate_arrays() # <---- the thing i am looking for.... Now a.energy, a.i0, etc should be array<shape=(11,)> Hope that's clear. B -- Bruce Ravel ------------------------------------ bravel(a)bnl.gov National Institute of Standards and Technology Synchrotron Science Group at NSLS-II Building 743, Room 114 Upton NY, 11973 Homepage: http://bruceravel.github.io/home/ Beamline: https://www.bnl.gov/ps/beamlines/beamline.php?r=6-BM Software: https://github.com/bruceravel Demeter: http://bruceravel.github.io/demeter/

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looking for β-Mo2C standard
by woschangqiang＠126.com 13 Dec '17

13 Dec '17

Hello, dear everyone. I am analysing some data about Mo K edge, but lack of standards. I searched many websites and mailing list, and only found the data from Carlo Segre. I am still need the data of β-Mo2C. Can anyone help sent me a data copy, if you have β-Mo2C. Thank you very much. Best regards, Qiang CHANG UCAS

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Units for density in Athena's Booth self-absorption correction?
by John Christopher Lin 11 Dec '17

11 Dec '17

Dear XAFS community, I am trying to use the Booth algorithm to correct for self-absorption in Athena, and one of the input fields is for the density of the material. What units should be used for the density in that field? (I could not find the answer in Section 9.9 of the Athena documentation on self-absorption approximations.) Many thanks, John

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how to import this kind of XAFS data
by woschangqiang＠126.com 11 Dec '17

11 Dec '17

Dear Bruce Ravel, Matt Newville and Carlo Segre, I am sorry to reply late. Thanks very much for your time and detailed explanations. Qiang CHANG Unversity of Chinese Academy of Sciences

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Re: [Ifeffit] Ifeffit Digest, Vol 178, Issue 9
by Christopher Thomas Chantler 10 Dec '17

10 Dec '17

Dear all The two best tests of any self-absorption correction are 1. that the resulting curve looks like an absorption curve, and the slope is consistent with one above the edge and 2. the pixels in a two-dimensional detector are consistent with such a pixel-dependent correction without excessive fitting parameters. That is, the pixel geometry is corrected for. It is not trivial to do this with a single channel, pixel or spectrum. Chris -------------------------------------------------------------------------------------- Christopher Chantler, Professor, FAIP, Fellow American Physical Society Editor-in-Chief, Radiation Physics and Chemistry Chair, International IUCr Commission on XAFS CIT, CCN President, International Radiation Physics Society School of Physics, University of Melbourne Parkville Victoria 3010 Australia +61-3-83445437 FAX +61-3-93474783 chantler(a)unimelb.edu.au<https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdA…> chantler(a)me.com<https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdA…> http://optics.ph.unimelb.edu.au/~chantler/xrayopt/xrayopt.html<https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdA…> http://optics.ph.unimelb.edu.au/~chantler/home.html<https://owa.unimelb.edu.au/owa/redir.aspx?C=c7BoS0kVVkC1_S95-9x9l5cBu6YTjdA…> ________________________________ From: Ifeffit <ifeffit-bounces(a)millenia.cars.aps.anl.gov> on behalf of ifeffit-request(a)millenia.cars.aps.anl.gov <ifeffit-request(a)millenia.cars.aps.anl.gov> Sent: Monday, 11 December 2017 5:00:01 AM To: ifeffit(a)millenia.cars.aps.anl.gov Subject: Ifeffit Digest, Vol 178, Issue 9 Send Ifeffit mailing list submissions to ifeffit(a)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(a)millenia.cars.aps.anl.gov You can reach the person managing the list at ifeffit-owner(a)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. Units for density in Athena's Booth self-absorption correction? (John Christopher Lin) 2. Re: Units for density in Athena's Booth self-absorption correction? (Matt Newville) ---------------------------------------------------------------------- Message: 1 Date: Sun, 10 Dec 2017 02:30:05 +0000 From: John Christopher Lin <jlin9(a)stanford.edu> To: "ifeffit(a)millenia.cars.aps.anl.gov" <ifeffit(a)millenia.cars.aps.anl.gov> Subject: [Ifeffit] Units for density in Athena's Booth self-absorption correction? Message-ID: <MWHPR02MB3358E7D14D4E058A9F44C79F8F360(a)MWHPR02MB3358.namprd02.prod.outlook.com> Content-Type: text/plain; charset="iso-8859-1" Dear XAFS community, I am trying to use the Booth algorithm to correct for self-absorption in Athena, and one of the input fields is for the density of the material. What units should be used for the density in that field? (I could not find the answer in Section 9.9 of the Athena documentation on self-absorption approximations.) Many thanks, John

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how to import this kind of XAFS data
by woschangqiang＠126.com 08 Dec '17

08 Dec '17

Hello, dear everyone. I downloaded a XAFS data about mettalic Ru from the website of ixs.iit.edu. There are 4 groups of information in the data, and each ranges between ~67800 with ~63000 in energy. So how to import the data to Athena, and how this kind of data was produced? Does anyone come across this situation? Thanks for your time and help in advance. Q. CHANG Unversity of Chinese of Academy of Sciences

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Hello
by Neama Imam 08 Dec '17

08 Dec '17

Dear Sir I am new user of Demeter, i would like to find he exact steps of Athena and Artemis. Best Regards Neama Imam : Post Doc. Position - XAFS beamline - Elettra-Sincrotrone Trieste S.C.p.A. Strada Statale 14, Km 163.5 Basovizza (Trieste), 34149 Trieste-Italia ( neama.imam(a)elettra.eu) and Lecturer : Atomic Energy Authority Nuclear Research Center Exp. Nuclear Phys. Dept. Solid State and Nanotechnology Lab. Cairo, Abou-Zabaal, Inshas , Egypt P.O. : 13759 Fax: 00-202-44520612 imam.eaea(a)gmail.com, nama_emam2018(a)yahoo.com

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Re: [Ifeffit] Demeter 0.9.26 launch faillure
by Kirill Lomachenko 06 Dec '17

06 Dec '17

Dear Kathy and Robert, great, it works! Thanks a lot Kirill

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