May 2021 - Ifeffit - millenia.cars.aps.anl.gov

Analyzing EXAFS data on Artemis
by Alexandros Deltsidis 28 May '21

28 May '21

Dear mailing list, I am currently analyzing some EXAFS data. I am studying a Lix(C5H5N)FeSe system in a temperature grid that extends from 20 K to 300 K and I have 4 such datasets which correspond to different amount of doping (x). Right now, im focusing on fitting the 1st coordination cell, in Artemis for the Se K-edge. My starting model is the simple P4/nmm FeSe. So, in my system the 1st coordination cell, in the Se K-edge, corresponds to the Se (absorber) - Fe (backscatterer) pair. I have 2 questions: 1) I realize now, that I have a certain impurity in the high doping range on my system, namely Li2Se. I try to include a scattering path from the respective Li2Se crystal model in my fits, since a Se (absorber) - Li (backscatterer) pair is present in the R-range of my fit in the Forward Fourier Transform. My question here is if this makes sense since Li is much smaller scatterer compared to Se. In other words, does it make sense to look for physical parameters (Li-Se bond length and DW factor respectively) of a signal (Se-Li) that is "tucked" in below the main peak coming from the "majority" Se-Fe signal in the FFT? 2)Also, I'm attempting to extract an Einstein temperature for each of those datasets, by utilizing the "eins(T, thetae)" function implemented in Artemis. What is the equation that is parametrized here? Does it include the s0^2 offset term that accounts for the overall configuration disorder in the system? And if that is the case is there same way to separate it from the temperature dependent s^2 term? Thank you in advance, Deltsidis Alexandros PS:I am attaching a png. file exported from Artemis that is relative to my question 1) Ph.D candidate, Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology - Hellas (FORTH)

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Free Oxford Ion Chambers Available [SEC=OFFICIAL]
by MITCHELL, Valerie 25 May '21

25 May '21

Dear All, The XAS beamline at the Australian Synchrotron has four Oxford IC SPEC ion chambers available for free (picture attached). If interested please let me know, and I'm happy to answer any questions. Kind regards, Valerie Mitchell OFFICIAL

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APS/IIT EXAFS Summer School
by Carlo Segre 19 May '21

19 May '21

Hello All: I am attaching the announcement for the 2021 APS/IIT EXAFS Summer School which will be held virtually this year from August 1-4, 2021. Please see the attached for more detail. To register, please send email to Grant Bunker <bunker(a)iit.edu> Carlo -- Carlo U. Segre -- Duchossois Leadership Professor of Physics Professor of Materials Science & Engineering Director, Center for Synchrotron Radiation Research and Instrumentation Illinois Institute of Technology Voice: 312.567.3498 Fax: 312.567.3494 segre(a)iit.edu http://phys.iit.edu/~segre segre(a)debian.org

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IMP: Inquiry for a postdoc position
by Nirmalendu Patra 18 May '21

18 May '21

Dear XAS group Members, I apologize in advance for spamming everyone with this posting. I am Nirmalendu Patra (Ph.D). I have been working as a postdoc in Dr. Simon R. Bare’s group at Stanford Synchrotron Radiation Light Source (SSRL), SLAC National Accelerator Laboratory, California, USA since June of 2020. My current role in the group is to support the team effort to broaden the experimental capabilities by conducting the in-situ XAS (XANES / EXAFS) experimental plan, data acquisition and analysis using IFEFFIT software package (Athena and Artemis) and finally preparing the manuscript. I am also working on the Principal component analysis (PCA) and clustering using TXM XANES Wizard to visualize the unidentified chemical species and the pattern in a large dataset. Before my current postdoc position, I graduated with a Ph.D. in Physics, working on the X-ray Absorption Spectroscopy studies on magnetic thin films and bulk materials at the Indus-2 Synchrotron, RRCAT, Indore, India under the guidance of Dr. Dibyendu Bhattacharyya, BARC, Mumbai, India. The title of my thesis was “Investigation on local structures of various thin film Heusler alloys by XAS and XMCD measurements”. The main objective of my thesis study the local atomic structure, surface morphology and elemental composition of the PLD deposited Heusler alloy thin ﬁlms and correlate their atomic structure with their magnetic properties. My postdoctoral fellowship with Dr. Bare is ending on June 25th, 2021. I am looking for a new postdoctoral position that will enable me to study materials for energy conversion and storage. I am also interested in studying electronic, structural, physio-chemical properties and morphology of materials using advanced spectroscopy techniques. XAS study on metallic alloys or metal oxide thin ﬁlms for spintronic applications are also a part of my research interest. My resume is attached here, and more details can be found from my LinkedIn profile (www.linkedin.com/in/nirmalendu-patra-82701365) If any group has an opening for a postdoc position, kindly respond to my email. Because of the COVID situation in India, I don't want to return now. So trying hard to find a new position. I am available for hiring and will appreciate your help to find a postdoc position. Thank you. With kind regards, *Nirmalendu Patra*

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Illinois Tech Synchrotron Radiation Course
by Carlo Segre 09 May '21

09 May '21

Hello All: Illinois Tech is offering the graduate Introduction to Synchrotron Radiation course once again in Fall 2021. Please see the attached course summary. The course is offered online and it is very straightforward to apply as a non-degree graduate student as late as the second week of classes in September. The online course will be a one (1) credit course instead of the three (3) credits taken by degree-seeking Illinois Tech students. If you are interested or have interested students please contact me for more details on the course or how to apply and register. Cheers, Carlo -- Carlo U. Segre -- Duchossois Leadership Professor of Physics Professor of Materials Science & Engineering Director, Center for Synchrotron Radiation Research and Instrumentation Illinois Institute of Technology Voice: 312.567.3498 Fax: 312.567.3494 segre(a)iit.edu http://phys.iit.edu/~segre segre(a)debian.org

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Postdoc positon in synchrotron characterization of lithium-ion batteries available at SOLEIL
by BELIN Stephanie 06 May '21

06 May '21

Dear All, I would like to share information about one funded Postdoc positions at SOLEIL synchrotron. We are looking for a Postdoc candidate on advanced synchrotron characterization of lithium-ion batteries within the framework of the Battery Interface Genome Materials Accelerated Platform (BIG-MAP<http://www.big-map.eu>, www.big-map.eu<http://www.big-map.eu>). The Postdoc position is dedicated to the development of versatile electrochemical cells and set-ups for operando experiments using spectroscopic and scattering techniques such as synchrotron X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES), X-ray diffraction (XRD), and small-angle X-ray scattering (SAXS), combined with conventional laboratory techniques, such as Raman scattering. Please find the advertisement in the attachment. https://www.synchrotron-soleil.fr/en/job-offers/post-doctoral-position-adva… Please pass on to suitable candidates you are aware of and disseminate to relevant networks! Thank you for your help. With kind regards, Stéphanie &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& Dr Stéphanie BELIN ROCK beamline scientist tel. (0033) 01 69 35 96 45 ROCK (0033) 01 69 35 81 46 Fax (0033) 01 69 35 94 57 Email : stephanie.belin(a)synchrotron-soleil.fr<mailto:stephanie.belin@synchrotron-soleil.fr> Synchrotron SOLEIL - Division Expériences L'orme des Merisiers - Saint Aubin BP48 91192 GIF sur YVETTE [cid:image002.png@01D105CE.75C2FD50] http://www.synchrotron-soleil.fr<http://www.synchrotron-soleil.fr/> &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

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