The on-line application for the 2007 APS XAFS School is now available at xafs.org http://www.xafs.org/Workshops/APS2007 ~^^~^~^~~^~^~^~^~^~^~^~^~~^~^~ Julie O. Cross Advanced Photon Source Argonne National Lab 9700 South Cass Ave., Bldg. 401/B4204 Argonne IL 60439 tel: 630 327 7825 fax: 630 252 0580 ~^^~^~^~~^~^~^~^~^~^~^~^~~^~^~
Please save the date: October 2-4, 2007 A three-day workshop/short course "In situ XAFS studies of nanomaterials: from ultra-small nanocatalysts to nanowires" National Synchrotron Light Source, Brookhaven National Laboratory The workshop will follow the format of previous NSLS and APS XAFS schools. Target group: "intermediate" level users, with hands on experience with Athena, Artemis, and FEFF. Focus: application of XAFS to novel nanoscale systems of interest for catalysis and materials science. Introduction to Quick XAFS - data collection, processing and analysis. Advanced methods and tricks in data analysis. Course information will soon appear on the Synchrotron Catalysis Consortium (www.yu.edu/scc) and National Synchrotron Light Source (www.nsls.bnl.gov) web sites. Anatoly Frenkel Associate Professor Department of Physics, Yeshiva University 245 Lexington Avenue, New York, NY 10016 http://www.yu.edu/faculty/afrenkel Spokesperson Synchrotron Catalysis Consortium http://www.yu.edu/scc Office: (212) 340-7827 Laboratory: (631) 344-3013 Fax: (212) 340-7868 anatoly.frenkel@yu.edu
This sounds possibly interesting. I wonder if experience with my own code would suffice instead of experience with Athena, which I never did really learn. Anyway, I looked at yu.edu/scc and found no courses listed there newer than 2006. On another topic, do you know of a good book or review on EXAFS newer than Konigsberger&Prins and the others from that classic era? I occasionally get asked and it seems absurd that I should have to recommend something from the 1980's. mam ----- Original Message ----- From: Anatoly Frenkel To: XAFS Analysis using Ifeffit Cc: hanson1@bnl.gov ; kao@bnl.gov ; adzic@bnl.gov ; chen@che.udel.edu Sent: Tuesday, May 08, 2007 11:25 AM Subject: [Ifeffit] 2007 NSLS XAFS workshop: save the date Please save the date: October 2-4, 2007 A three-day workshop/short course "In situ XAFS studies of nanomaterials: from ultra-small nanocatalysts to nanowires" National Synchrotron Light Source, Brookhaven National Laboratory The workshop will follow the format of previous NSLS and APS XAFS schools. Target group: "intermediate" level users, with hands on experience with Athena, Artemis, and FEFF. Focus: application of XAFS to novel nanoscale systems of interest for catalysis and materials science. Introduction to Quick XAFS - data collection, processing and analysis. Advanced methods and tricks in data analysis. Course information will soon appear on the Synchrotron Catalysis Consortium (www.yu.edu/scc) and National Synchrotron Light Source (www.nsls.bnl.gov) web sites. Anatoly Frenkel Associate Professor Department of Physics, Yeshiva University 245 Lexington Avenue, New York, NY 10016 http://www.yu.edu/faculty/afrenkel Spokesperson Synchrotron Catalysis Consortium http://www.yu.edu/scc Office: (212) 340-7827 Laboratory: (631) 344-3013 Fax: (212) 340-7868 anatoly.frenkel@yu.edu ------------------------------------------------------------------------------ _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
Hi Matthew, Heh. Although this doesn't help you, I figure I'll take this opportunity to give a brief plug for my own project. I am in the beginning stages of developing a textbook "at the undergraduate level" on EXAFS analysis (primarily; I plan chapters on XANES, sample preparation, etc. as well). "At the undergraduate level" is in quotes because it's really not what I envision as the primary audience. Instead, it's for more or less the audience that takes the short courses: people who want to add EXAFS as a characterization technique in their arsenal, understand what they read about it in the literature better, and the like. In those cases, I don't think people need to know the ins and outs of Green's functions, for instance. Unfortunately, it won't be done for several years. :( --Scott Calvin Sarah Lawrence College At 03:36 PM 5/8/2007, you wrote:
On another topic, do you know of a good book or review on EXAFS newer than Konigsberger&Prins and the others from that classic era? I occasionally get asked and it seems absurd that I should have to recommend something from the 1980's.
That's great. Even though it will be several years, I'll still want to see the result when it happens. What you describe is
exactly what I think is needed.
mam
----- Original Message -----
From: "Scott Calvin"
Hi Matthew,
Heh. Although this doesn't help you, I figure I'll take this opportunity to give a brief plug for my own project.
I am in the beginning stages of developing a textbook "at the undergraduate level" on EXAFS analysis (primarily; I plan chapters on XANES, sample preparation, etc. as well). "At the undergraduate level" is in quotes because it's really not what I envision as the primary audience. Instead, it's for more or less the audience that takes the short courses: people who want to add EXAFS as a characterization technique in their arsenal, understand what they read about it in the literature better, and the like. In those cases, I don't think people need to know the ins and outs of Green's functions, for instance.
Unfortunately, it won't be done for several years. :(
--Scott Calvin Sarah Lawrence College
At 03:36 PM 5/8/2007, you wrote:
On another topic, do you know of a good book or review on EXAFS newer than Konigsberger&Prins and the others from that classic era? I occasionally get asked and it seems absurd that I should have to recommend something from the 1980's.
_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
Attached is a brainteaser which I think is cute. Too late for the April fool's day but still... Some comments: three consecutive scans of the same sample were taken in this order: scan 1, 2 and 3. Duration: 30 minutes per scan. If these data look unusual to you please tell us why and what could've happened in this experiment. Those of you who send first three correct answers will be acknowledged! Anatoly
MessageThe most obvious explanation for why the post-edge scans line up and the pre-edges don't is that the transmission chamber current amp or V/F is saturated and reads a fixed value below the edge. As the ring current decays, I0 goes down while It is fixed below the edge, so ln(I0/It) decreases as observed. With this explanation, and noting that ln(I0/It) decreased by about 0.05 in an hour, I infer that the stored-beam lifetime is ~20hr. mam ----- Original Message ----- From: Anatoly Frenkel To: anatoly.frenkel@yu.edu ; 'XAFS Analysis using Ifeffit' Sent: Thursday, April 03, 2008 6:13 PM Subject: [Ifeffit] Brainteaser Attached is a brainteaser which I think is cute. Too late for the April fool's day but still... Some comments: three consecutive scans of the same sample were taken in this order: scan 1, 2 and 3. Duration: 30 minutes per scan. If these data look unusual to you please tell us why and what could've happened in this experiment. Those of you who send first three correct answers will be acknowledged! Anatoly ------------------------------------------------------------------------------ _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
I apologize to everyone who Matthew did not even give a chance to think but the excuse is that Matthew is really good! It was a saturation of the I_t current amplifier. Another sign of that is too sharp a rise of the edge right after the pre-edge - it is when the I_t signal drops below the saturation limit. A comment: the last time NSLS had 20h of stored beam lifetime was in the 20th century, I think, but it is besides the point. Anatoly -----Original Message----- From: Matthew Marcus [mailto:mamarcus@lbl.gov] Sent: Thursday, April 03, 2008 9:30 PM To: anatoly.frenkel@yu.edu; XAFS Analysis using Ifeffit Subject: Re: [Ifeffit] Brainteaser The most obvious explanation for why the post-edge scans line up and the pre-edges don't is that the transmission chamber current amp or V/F is saturated and reads a fixed value below the edge. As the ring current decays, I0 goes down while It is fixed below the edge, so ln(I0/It) decreases as observed. With this explanation, and noting that ln(I0/It) decreased by about 0.05 in an hour, I infer that the stored-beam lifetime is ~20hr. mam ----- Original Message ----- From: Anatoly Frenkel mailto:frenkel@bnl.gov To: anatoly.frenkel@yu.edu ; 'XAFS Analysis using mailto:ifeffit@millenia.cars.aps.anl.gov Ifeffit' Sent: Thursday, April 03, 2008 6:13 PM Subject: [Ifeffit] Brainteaser Attached is a brainteaser which I think is cute. Too late for the April fool's day but still... Some comments: three consecutive scans of the same sample were taken in this order: scan 1, 2 and 3. Duration: 30 minutes per scan. If these data look unusual to you please tell us why and what could've happened in this experiment. Those of you who send first three correct answers will be acknowledged! Anatoly _____ _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
On Thursday 03 April 2008 21:52:46 Anatoly Frenkel wrote:
A comment: the last time NSLS had 20h of stored beam lifetime was in the 20th century, I think, but it is besides the point.
At this moment, according to the machine status on the web, the NSLS lifetime is 19.31 hours. As you said, Marcus knows what he's talking about. I was going to guess "crappy data analysis software", but that's always my first answer! ;-) B -- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2 Building 535A Upton NY, 11973 My homepage: http://xafs.org/BruceRavel EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/
A comment: the last time NSLS had 20h of stored beam lifetime was in
Bruce and Matthew are absolutely correct - the lifetime is not the average time between successive beam dumps as I mistakenly thought. Anatoly -----Original Message----- From: Ravel, Bruce [mailto:bravel@bnl.gov] Sent: Friday, April 04, 2008 8:45 AM To: anatoly.frenkel@yu.edu; XAFS Analysis using Ifeffit Subject: Re: [Ifeffit] Brainteaser On Thursday 03 April 2008 21:52:46 Anatoly Frenkel wrote: the
20th century, I think, but it is besides the point.
At this moment, according to the machine status on the web, the NSLS lifetime is 19.31 hours. As you said, Marcus knows what he's talking about. I was going to guess "crappy data analysis software", but that's always my first answer! ;-) B -- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2 Building 535A Upton NY, 11973 My homepage: http://xafs.org/BruceRavel EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/
participants (5)
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Anatoly Frenkel
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Bruce Ravel
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Julie Olmsted Cross
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Matthew Marcus
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Scott Calvin