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

Nanocrystalline NiO
by Christian Wittee Lopes 18 Jan '21

18 Jan '21

Dear all, Firstly I would like to wish you a much better year than in 2020. Does anyone have some spectra of nanocrystalline NiO (not bulk standards)? I have a spectrum of a mixed compound and would like to get more insights into what I really have in this sample. Thank you in advance!!! Kind regards, -- *Christian Wittee Lopes* *Visiting Researcher* ANP/FINEP - PRH50 Institute of Chemistry, Universidade Federal do Rio Grande do Sul (UFRGS) Phone: +55 54 992430264

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Larch: AttributeError
by Rachita Rana 13 Jan '21

13 Jan '21

Hi Everyone, I am using Larch for reading and fitting EXAFS data and I get the autobk and Fourier transforms working. But when I try to generate the fefffpaths and fit the data I get an error from the feffit function. I am using the developer version of Larch on MC OS Catalina. Below is the error and the sample script- runfile('/Users/rachita/Box/Larch/Feff_Try2/001.py', wdir='/Users/rachita/Box/Larch/Feff_Try2') Traceback (most recent call last): File "/Users/rachita/Box/Larch/Feff_Try2/001.py", line 27, in <module> fit = feffit(params, dset) File "/Users/rachita/opt/anaconda3/lib/python3.8/site-packages/xraylarch-0.9.50-py3.8.egg/larch/xafs/feffit.py", line 534, in feffit ds.prepare_fit(params=params) File "/Users/rachita/opt/anaconda3/lib/python3.8/site-packages/xraylarch-0.9.50-py3.8.egg/larch/xafs/feffit.py", line 265, in prepare_fit ikmax = int(1.01 + max(self.data.k)/trans.kstep) AttributeError: 'AthenaGroup' object has no attribute ‘k’ #tried this with xdi format data and got the same error Below is the script - #!/usr/bin/env python3 # -*- coding: utf-8 -*- from larch.fitting import param_group, Parameter from larch.io <http://larch.io/> import read_xdi from larch.xafs import feffpath, feffit_dataset, feffit_transform, feffit, feffit_report data = read_xdi('cu_metal_rt.xdi’) #I tried importing Athena project file too path1 = feffpath('feff0001.dat', s02='amplitude', e0='del_e0', sigma2='sigma2', deltar='del_r') trans = feffit_transform(kmin=3, kmax=16, kw=(2,1,3), dk=1, window='hanning', rmin=1.7, rmax=3.1) params = param_group(amplitude= Parameter(1, vary=True), del_e0 = Parameter(1e-7, vary=True), del_r = Parameter(1e-7, vary=True), sigma2 = Parameter(0.003, vary=True)) dset = feffit_dataset(data=data, pathlist=[path1], transform=trans) fit = feffit(params, dset) print(feffit_report(fit)) By printing path groups and transform fit, I confirmed that the data is read correctly. Please let me know if there are ways to fix this or if there is an error in my script. Thank You! Rachita

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Artemis\Plot mismatch\Artemis[Plot]&Artemis [Feff] Atoms and Feff
by Huaming 11 Jan '21

11 Jan '21

Dear all, I am using Artemis for EXAFS data fitting and found that the |χ(R)| plot shown in "Artemis [Plot]" and "Artemis [Feff] Atoms and Feff" are in great difference for a same scattering path. However, the |χ(k)| plots shown in the above two windows is the same. For the plot shown in "Artemis [Feff] Atoms and Feff" window, one path is selected and 'Plot path' is clicked. For the plot shown in "Artemis [Plot]", the same path is dragged into the "Artemis window" and then transfered path and plot in R by click "Action" menu. I would like to know what is the difference of data shown in the two windows. BTW, whether it is possible to have two peaks in the |chi(R)| plot for a single scattering path? For some scatters with high-Z, the f(k) may feature multiple peaks. Thanks, All bests, Huaming Hou

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How do I create a histogram based on R-space values
by Deepak Varanasi 10 Dec '20

10 Dec '20

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How to perform normalisation and background removal of data containing L3 and L2 edges
by Deka, N. 07 Dec '20

07 Dec '20

Dear all I am a student trying to learn Athena for XAS data processing. Attached is a data file which contains L3 and L2 edge of Ru. What should be the right parameters for background removal and normalization of this data set? In the videos from Bruce Ravel, I could not find any example for such a data set containing two edges. Thank you Best Regards, Nipon Deka Leiden University

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Unable to see background and "k", "q", "R" plots for imported data
by Deka, N. 07 Dec '20

07 Dec '20

Dear all I am a new student trying to work with Athena for XAS data processing. Attached is a data file which when I import does not show the background and also Athena cannot plot "k" , "q" , "R" plots for the data. Please suggest me a possible solution. Thank you Best Regards, Nipon Deka Leiden University

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Re: [Ifeffit] Unable to see background and "k", "q", "R" plots for imported
by Mosselmans, Fred (DLSLtd,RAL,SCI) 07 Dec '20

07 Dec '20

Dear Nipon, I suspect you have read the spectrum in as XANEs if you change the data type to mu(e)(e) it should give you what you want Thanks Fred Mosslemans Message: 2 Date: Mon, 7 Dec 2020 15:26:19 +0000 From: "Deka, N." <n.deka(a)lic.leidenuniv.nl> To: "ifeffit(a)millenia.cars.aps.anl.gov" <ifeffit(a)millenia.cars.aps.anl.gov> Subject: [Ifeffit] Unable to see background and "k", "q", "R" plots for imported data Message-ID: <3088c35cdc4c4e488b2782623526d7bb(a)lic.leidenuniv.nl> Content-Type: text/plain; charset="us-ascii" Dear all I am a new student trying to work with Athena for XAS data processing. Attached is a data file which when I import does not show the background and also Athena cannot plot "k" , "q" , "R" plots for the data. Please suggest me a possible solution. Thank you Best Regards, Nipon Deka Leiden University

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Postdoctoral research opportunity in photocatalysis and x-ray spectroscopy
by Sokaras, Dimosthenis 06 Dec '20

06 Dec '20

Hello XAFS Community, We have a new postdoctoral research opportunity in the field of photocatalysis, aiming to study photocatalytic conversion of CO2 to liquid fuels. The selected candidate will be performing time-resolved and operando x-rays characterizations of photocatalytic materials in order to extract fundamental electronic-structure insights that can correlate and guide catalytic activity and photocatalysts material’s properties. An extensive part of the research will take place at LBNL/SLAC where the candidate will be developing and performing novel x-ray spectroscopy methodologies. Applicants interested in this opportunity may reach out to Junko Yano (LBNL, jyano(a)lbl.gov) and Dimosthenis Sokaras (SLAC, dsokaras(a)slac.stanford.edu) Thank you, Junko Yano and Dimosthenis Sokaras

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LARCH- XRF- fitting the spectrum
by Ana Mijo 04 Dec '20

04 Dec '20

Hello, I have images from GSECARS. I am trying to improve the background reduction by fitting the spectrum and getting new ROIs. I did a fit but I don’t manage to update the ROI’s. I tried saving to a .mca file and uploading again but I don’ t see a change. Since I come from other software I may have pre-concepts, maybe the first question is: can a new fit be done and get new (maybe cleaner) images? or Can I only work with the ROI’s from the experiment? If it can be done, how should I proceed after doing the fit to update ROI’s? I have emailed this question to Matt also (before finding this mailing list). Thanks in advance, Best regards, Ana Ana Mijovilovich Czech Republic ana_mijo(a)yahoo.com

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Pd nanoparticle K-edge XANES
by Eva Bajnoczi 30 Nov '20

30 Nov '20

Dear Mailing List Readers, I wonder if there is anyone who has and also would be willing to provide a K-edge XANES spectrum measured on Pd nanoparticles. Or to point me to a source where I can find one. Our particles most probably around 5nm, so this size-range would be ideal, but anything would be very much appreciated, as that would be a better reference than metallic Pd foil. We have got some interesting reviewer questions on a paper and to answer them a Pd nanoparticle XANES would be highly useful, but under the circumstances, it is not possible to measure it on our own in the forseeable future. Thank you for any kind of help in advance! Best regards, Eva Bajnoczi -- Bajnóczi Éva / Éva Bajnóczi tudományos munkatárs / research fellow Wigner Fizikai Kutatóközpont / Wigner Research Centre for Physics 1121 Budapest, Konkoly-Thege Miklós út 29-33. Magyarország / Hungary

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Workshop Opportunity for XAS users in the field of Biogeochemistry.
by Ritimukta Sarangi 24 Nov '20

24 Nov '20

Hello, Apologies for the mass email. SSRL, in conjunction with EMSL is organizing a Workshop titled "Spectroscopy and Modeling for Molecular Insights into Environmental Processes" on 26, Jan 2021. The main focus is to encourage and provide help in getting started with the use of theory and modeling (such as DFT and MD) in the interpretation of EXAFS/XAS data. Please find more information in the event flyer below: https://www.dropbox.com/s/vvshxqpji4yok2s/SSRL_EMSL_Workshop_Flyer.pdf?dl=0 We encourage interested users and research groups to register and attend the workshop. Looking forward to your participation. Best regards, Riti Sarangi SSRL

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Two phases EXAFS fitting-help
by Chen, Danting 10 Nov '20

10 Nov '20

Hi Mr/Ms, I have a sample and get a two major phases result by linear combination analysis, one dominate 59.5% of hydrozincite( and another is 33.5% zinc phosphate (. I would like to use Artemis to fit the k-space and the first shell of R-space. For R-space, my idea is to fit the first Zn-O shell since both dominate phases are both tetrahedral and octahedral coordination and the first shell is the similar environment. For k-space, shall I fit each phase with the sample individually and then sum the different weight of fitting curve together to see how it fit finally? If it is right, may I ask how exactly it fits? I have no idea how the weight is set in Artemis or it can only be summed half by half? Also, since my sample numbers are only two, I am unable to use PCA to fit. Except the above mentioned, is there anything else that I can do? Sorry, I am a new learner of XAS and have many things to learn. Best Wishes, Danting Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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Re: [Ifeffit] Postdoctoral positions in MSEE EFRC at Brookhaven National Lab
by Gill, Simerjeet 09 Nov '20

09 Nov '20

Hello XAFS Community, On behalf of Energy Frontier Research Center on Molten Salts in Extreme Environments (MSEE) at Brookhaven National Laboratory (BNL), I would like to bring your attention to two postdoctoral Research Associate positions within the Energy Frontier Research Center (EFRC) on Molten Salts in Extreme Environments. The positions require a Ph.D. degree in chemistry, physics, materials science or a related field. The interdisciplinary research will focus on structural and spectroscopic investigation of molten salts, solutes in them, and liquid-solid interfaces. The positions are located in the BNL Nuclear Science and Technology Department (Job ID 2335) and Chemistry Department (Job ID 2341). Experiments will be performed at the National Synchrotron Light Source II (NSLS-II), BNL's new, state-of-the-art synchrotron, the BNL Chemistry Division and the BNL Center for Functional Nanomaterials. To find detailed descriptions of the position requirements and apply online, go to https://jobs.bnl.gov<https://jobs.bnl.gov/>. For Job ID 2335, hands-on experience in either X-ray scattering, spectroscopy and reflectivity is required. For Job ID 2341, demonstrated experience in electrochemical methods or working with molten salts is required. Experience with the chemical and physical properties of materials at high-temperature is highly desirable for both positions. If you have follow up questions, please don't hesitate to contact: Jim Wishart: wishart(a)bnl.gov<mailto:wishart@bnl.gov> or Simerjeet Gill: gills(a)bnl.gov<mailto:gills@bnl.gov>. For position 2335, postdoc will investigate molten salt systems using NSLS-II beamline facilities at Brookhaven National Laboratory, with primary technique being X-ray absorption fine structure. This position will be in Nuclear Science and Technology Department at Brookhaven National Lab, Under supervision of Dr. Simerjeet Gill. Responsibilities will include performing synchrotron experiments on molten salt systems with and without actinides and collaborating with other participants of MSEE-EFRC. For inquiries, please email me at gills(a)bnl.gov<mailto:gills@bnl.gov>. Thank you, Simerjeet K Gill, Group leader, Nuclear Science and Technology Department, Brookhaven National Lab, Upton, NY 11973

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Postdoctoral position in MSEE EFRC at Brookhaven National Lab
by Gill, Simerjeet 03 Nov '20

03 Nov '20

Hi, I would like to post below message regarding postdoc positions in MSEE EFRC at BNL, with attached flyer to XAFS community. Thanks, Simer Hello XAFS Community, On behalf of Energy Frontier Research Center on Molten Salts in Extreme Environments (MSEE) at Brookhaven National Laboratory (BNL), I would like to bring your attention to two postdoctoral Research Associate positions within the Energy Frontier Research Center (EFRC) on Molten Salts in Extreme Environments. Information about the positions is summarized in a flyer attached to this message. For position 2325, postdoc will investigate molten salt systems using NSLS-II beamline facilities at Brookhaven National Laboratory, with primary technique being X-ray absorption fine structure. This position will be in Nuclear Science and Technology Department at Brookhaven National Lab, Under supervision of Dr. Simerjeet Gill. Responsibilities will include performing synchrotron experiments on molten salt systems with and without actinides and collaborating with other participants of MSEE-EFRC. For inquiries, please email me at gills(a)bnl.gov<mailto:gills@bnl.gov>. Thank you, Simerjeet K Gill, Group leader, Nuclear Science and Technology Department, Brookhaven National Lab, Upton, NY 11973

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XAS question
by Chen, Danting 29 Oct '20

29 Oct '20

Hi Mr/Ms, I am a new learner of XAS and meet a problem like before and hope you can give me some hints. [cid:image001.png@01D6ADDA.9D016B40] [cid:image005.png@01D6ADDA.9D016B40] I have a data set after merged and alignment. But at 11-13 A-1, the amplitude of k is much higher than normal but there seems no weird points at XAS spectrum. I wonder how I could deal with this part? If I shorter kmax and it must lose some important information. Best Wishes, Danting Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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Advanced XAS Workshop at CLS
by Gosia Korbas 27 Oct '20

27 Oct '20

Hi all, On behalf of the BioXAS team at the Canadian Light Source, I would like to invite you to participate in the virtual Advanced XAS Data Analysis and Modeling Workshop to be conducted in four half-day (8 AM to 1 PM, UTC-6, Saskatchewan Time) remote sessions through WebEX on November 10, 13, 20 and 24. The workshop is organized by the BioXAS-Spectroscopy senior scientist, Roman Chernikov. For more details and registration (free) please follow the link: https://bioxas-spectroscopy.lightsource.ca/advanced-spectroscopy-workshop-2… We hope to see you there! Gosia Korbas --------------------------------------------------------------------- Gosia Korbas, Ph.D. BioXAS-Imaging Senior Scientist BioXAS-Sector Responsible Canadian Light Source Phone: +1-306-657-3859 BioXAS-Imaging website<https://bioxas-imaging.lightsource.ca/> gosiakorbas.net<https://gosiakorbas.net/>

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Athena error on Linux mint
by Kyle Kluherz 26 Oct '20

26 Oct '20

I recently successfully installed the Demeter suite on my Linux Mint 19 machine. Last week, I updated to Linux Mint 20, and now I get the following error when trying to run athena from the command line: Can't locate Demeter/Here.pm in @INC (you may need to install the Demeter::Here module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.30.0 /usr/local/share/perl/5.30.0 /usr/lib/x86_64-linux-gnu/perl5/5.30 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.30 /usr/share/perl/5.30 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /usr/local/bin/dathena line 7. BEGIN failed--compilation aborted at /usr/local/bin/dathena line 7. I was wondering if there was a relatively easy way to fix this, or if the best recourse is to simply reinstall Demeter? It took some fiddling to install initially, so I don't want to reinstall it unless that's the easiest way to fix the issue. Also, the mailing list link on the Demeter home page (http://cars9.uchicago.edu/mailman/listinfo/ifeffit/) times out. Fortunately I was able to get a working link (https://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit) from a friend. Sincerely, Kyle Kluherz -- Kyle (Tk) Kluherz Graduate Student Gamelin & De Yoreo groups Department of Chemistry, UW Materials Science Division, PNNL

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Wyartite XAS spectrum?
by Mike Massey 17 Oct '20

17 Oct '20

Hi All, And now for something not-phosphorus... Does anyone happen to have a wyartite U L3-edge XAS spectrum laying around? If you do, and happened to be willing to talk with me about it, I would be most grateful. Kind Regards, Mike

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Re: [Ifeffit] P K-edge XANES spectrum question (Mangold, Stefan (IPS))- (Mike Massey); Re: Ifeffit Digest, Vol 212, Issue 7 (Luis Carlos Colocho Hurtarte)
by Ganga Hettiarachchi 16 Oct '20

16 Oct '20

Mike, Thanks, we will try diluted samples to make sure that this is not an issue due to concentration. Luis, Thanks for sharing those papers. We have plenty of OC in these systems, but Pb or other trace elements concentrations are very small (below 10 mg/kg). Best regards, Ganga -------------------- Ganga M. Hettiarachchi

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Re: [Ifeffit] Ifeffit Digest, Vol 212, Issue 7
by Ganga Hettiarachchi 16 Oct '20

16 Oct '20

Hello Dean, Thanks for this interpretation; it makes sense. I was (am still) quite surprised by the intense of Al(III) pre-edge feature as we did not detect anything else in our XRD work, except some Fe oxides (the product is X-ray amorphous most likely). Hello Mike, Thanks. We diluted this sample already to bring P concentration below 5000 mg/kg. We can potentially try further diluting, but when we go below that, sometimes we have a hard time getting a reasonable P spectrum in environmental samples. Best regards, Ganga -------------------- Ganga M. Hettiarachchi, Ph.D. Professor of Soil and Environmental Chemistry Department of Agronomy 2107 Throckmorton Plant Sciences Center 1712 Claflin Road Kansas State University Manhattan, KS 66506 USA 785-532-7209 (office) 785-532-6094 (FAX) http://www.agronomy.k-state.edu/research/soil-and-environment/soil-environm… http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/index.ht… -----Original Message----- From: Ifeffit [mailto:ifeffit-bounces@millenia.cars.aps.anl.gov] On Behalf Of ifeffit-request(a)millenia.cars.aps.anl.gov Sent: Friday, October 16, 2020 4:53 AM To: ifeffit(a)millenia.cars.aps.anl.gov Subject: Ifeffit Digest, Vol 212, Issue 7 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: P K-edge XANES spectrum question (Dean Hesterberg) 2. Re: P K-edge XANES spectrum question (Mike Massey) ---------------------------------------------------------------------- Message: 1 Date: Fri, 16 Oct 2020 05:21:58 -0400 From: Dean Hesterberg <dean_hesterberg(a)ncsu.edu> To: XAFS Analysis using Ifeffit <ifeffit(a)millenia.cars.aps.anl.gov> Subject: Re: [Ifeffit] P K-edge XANES spectrum question Message-ID: <CANEgao_RuxGJ7khkrwypyqu4FM333aw3iozgtPJHuZP6Sx9KSA(a)mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hello Ganga, That is a very interesting spectrum. Given what you said about the system, the lower energy feature at ~ 2146 eV should be Fe(III)-bonded phosphate and the feature at ~2149 eV should be Al(III)-bonded phosphate. Both produce pre-white line absorption peaks, but the Al-bonded phosphate peak is closer to the white line and less distinct in spectra of Al-phosphates like variscite and non-crystalline Al-phosphate, for example (see Khare et al. 2007. *Geochimica et Cosmochimica Acta* 71:4405, Fig. 5C). A significant proportion of the phosphate in your system apparently precipitated with Al-13 polymer structures in the aluminum chlorohydrate. Dean On Fri, Oct 16, 2020 at 1:26 AM Ganga Hettiarachchi <ganga(a)ksu.edu> wrote: > All, > > Can anyone provide some insight into the pre-edge ?features? in this P > XANES spectrum? > > This is the P XANES spectrum we got for a recovered P-product (rich in > Fe and Al) from wastewater using the AnMBR technology. During the > coagulation process, our collaborators (environmental engineers) used > stock solutions of aluminum chlorohydrate (ACH) and FeCl3. > > > > Thanks very much. > > > > Best regards, > > > > Ganga > > > > -------------------- > > > > Ganga M. Hettiarachchi, Ph.D. > > Professor of Soil and Environmental Chemistry > > Department of Agronomy > > 2107 Throckmorton Plant Sciences Center > > 1712 Claflin Road > > Kansas State University > > Manhattan, KS 66506 USA > > > > 785-532-7209 (office) > > 785-532-6094 (FAX) > > > > > http://www.agronomy.k-state.edu/research/soil-and-environment/soil-env > ironment-chem/ > > > http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/ind > ex.html > > > _______________________________________________ > Ifeffit mailing list > Ifeffit(a)millenia.cars.aps.anl.gov > http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit > Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit > -- DEAN HESTERBERG William Neal Reynolds Distinguished Professor of Soil Chemistry Dept. of Crop and Soil Sciences NC State University email: dean_hesterberg(a)ncsu.edu

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Re: [Ifeffit] P K-edge XANES spectrum question (Mangold, Stefan (IPS))
by Ganga Hettiarachchi 16 Oct '20

16 Oct '20

Stefan, Thanks for sharing your thoughts. Please share if you do have spectra for any other P (i.e., not +5). Best regards, Ganga -------------------- Ganga M. Hettiarachchi, Ph.D. Professor of Soil and Environmental Chemistry Department of Agronomy 2107 Throckmorton Plant Sciences Center 1712 Claflin Road Kansas State University Manhattan, KS 66506 USA 785-532-7209 (office) 785-532-6094 (FAX) http://www.agronomy.k-state.edu/research/soil-and-environment/soil-environm… http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/index.ht…

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P K-edge XANES spectrum question
by Ganga Hettiarachchi 16 Oct '20

16 Oct '20

All, Can anyone provide some insight into the pre-edge "features" in this P XANES spectrum? This is the P XANES spectrum we got for a recovered P-product (rich in Fe and Al) from wastewater using the AnMBR technology. During the coagulation process, our collaborators (environmental engineers) used stock solutions of aluminum chlorohydrate (ACH) and FeCl3. Thanks very much. Best regards, Ganga -------------------- Ganga M. Hettiarachchi, Ph.D. Professor of Soil and Environmental Chemistry Department of Agronomy 2107 Throckmorton Plant Sciences Center 1712 Claflin Road Kansas State University Manhattan, KS 66506 USA 785-532-7209 (office) 785-532-6094 (FAX) http://www.agronomy.k-state.edu/research/soil-and-environment/soil-environm… http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/index.ht…

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Postdoctoral Position(s) at SSRL - DOE BOTTLE Project.
by Ritimukta Sarangi 15 Oct '20

15 Oct '20

Hello XAFS Community, On behalf of the BOTTLE team at SLAC, I would like to bring three post-doctoral fellowship openings to your attention. Please visit: https://careers.slac.stanford.edu/jobs-slac/ra-and-postdocs The three positions with "Postdoc BOTTLE" in their names are the relevant postings. I am also including a pdf version of the position I have available in this email for easy reference. We look forward to hearing from interested candidates to join our team! Thank you, Riti Sarangi

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EXAFS, Spectroscopy and Imaging Summer School Youtube Page
by Ritimukta Sarangi 13 Oct '20

13 Oct '20

Hello EXAFS enthusiasts, We have uploaded our 2020 summer school material on the Youtube Channel : https://www.youtube.com/channel/UC3sd8ZqQkNfDK11jM8cOWzw/videos You may find useful material for your synchrotron XANES/EXAFS/Imaging research. You can subscribe and share the page with colleagues as an educational resource. In the future (TBD), we plan to include recorded videos on advanced spectroscopy techniques including soft and hard X-ray RIXS and XES methods. If there are SSRL related material that you would like us to prepare, please let us know and we can put it on the list. Thank you for your time. Best regards, Riti Sarangi SSRL.

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Ifeffit Question
by Nicholas Weingartz 08 Oct '20

08 Oct '20

Hello List, I'm having a strange problem with my EXAFS fits in Artemis in which they seem to fly off at higher k. I was having trouble with background fitting a particularly messy data set and I wanted more control over this so I used the program PySpline to fit the background after I did the rest of the preprocessing in Athena. I then imported the data into Athena and loaded the project into Artemis. Interestingly, when I only include a single path in the fit and plot both the single path and the overall fit, the single path does not fly off but the overall fit does. I have attached an image of the issue. When I use the spline fitting built into athena, I do not encounter this issue. Has anyone ever experienced this issue before? Thanks for your help! Nicholas Weingartz Ph.D Student Department of Chemistry Northwestern University [image: image.png]

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