Dear all, for the analysis of the location of the Al-dopant in ZnO, I am looking for suitable EXAFS beamlines. Dopant concentrations are 1-10%. So far I have only found ALS 6.3.1 and NSLS X15B. Can anybody recommend beamlines for Al EXAFS? My EXAFS experience is so far limited to the high energy range with signal detection in transmission (ionization chambers) and fluorescence (multi-element Ge-detectors). At such low energies as 1.5 keV for Al-K, the sample needs to be in vacuum, transmission will not work and Ge detectors probably the same. Does anybody have experience with Al-EXAFS, and can share a little about setup and what other complications to expect? Thank you, Alex.
Hi Alex The SGM beamline at the CLS does fine work at the Al K-edge. However, I'm not familiar with much Al EXAFS work, you would have to ask the beamline scientist, Tom Regier, about that. tom.regier@lightsource.ca Cheers Lachlan
-----Original Message----- From: ifeffit-bounces@millenia.cars.aps.anl.gov [mailto:ifeffit- bounces@millenia.cars.aps.anl.gov] On Behalf Of Kompch, Alexander Sent: October-11-11 8:48 AM To: XAFS using Ifeffit Analysis Subject: [Ifeffit] beamline for Al EXAFS
Dear all,
for the analysis of the location of the Al-dopant in ZnO, I am looking for suitable EXAFS beamlines. Dopant concentrations are 1-10%. So far I have only found ALS 6.3.1 and NSLS X15B. Can anybody recommend beamlines for Al EXAFS?
My EXAFS experience is so far limited to the high energy range with signal detection in transmission (ionization chambers) and fluorescence (multi- element Ge-detectors). At such low energies as 1.5 keV for Al-K, the sample needs to be in vacuum, transmission will not work and Ge detectors probably the same. Does anybody have experience with Al-EXAFS, and can share a little about setup and what other complications to expect?
Thank you, Alex. _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
For Al:K edge is rather hard to find a dedicated beamline for XAS. Of course are few where it can be measured, like in Bessy, Berlin U41-PGM, or BL1A in UV-SOR, Okazaki, Japan, or BACH in Elettra, Trieste, Itally. I do not how is situation in America, sorry. In this energy region you have to measure in fluorescence, or which is typical, in total electron yield (TEY). The sample, as your is, has to be be conductive, and have a good electrical contact with sample holder. Experimental geometry depends strongly on the vacuum chamber and available instruments. At this energy can be visible effect of surface contamination, especially for TEY, but must not. Sometimes LN2 cryostat is also available. is something more to add? kicaj W dniu 11-10-11 16:47, Kompch, Alexander pisze:
Dear all,
for the analysis of the location of the Al-dopant in ZnO, I am looking for suitable EXAFS beamlines. Dopant concentrations are 1-10%. So far I have only found ALS 6.3.1 and NSLS X15B. Can anybody recommend beamlines for Al EXAFS?
My EXAFS experience is so far limited to the high energy range with signal detection in transmission (ionization chambers) and fluorescence (multi-element Ge-detectors). At such low energies as 1.5 keV for Al-K, the sample needs to be in vacuum, transmission will not work and Ge detectors probably the same. Does anybody have experience with Al-EXAFS, and can share a little about setup and what other complications to expect?
Thank you, Alex. _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
Hi Alex,
You might find the list of beamlines at
http://www.iucr.org/resources/commissions/xafs/, compiled by Federico
Boscherini, a useful way to find a beamline that can acces at the Al
K-edge.
--Matt
On Tue, Oct 11, 2011 at 9:47 AM, Kompch, Alexander
Dear all,
for the analysis of the location of the Al-dopant in ZnO, I am looking for suitable EXAFS beamlines. Dopant concentrations are 1-10%. So far I have only found ALS 6.3.1 and NSLS X15B. Can anybody recommend beamlines for Al EXAFS?
My EXAFS experience is so far limited to the high energy range with signal detection in transmission (ionization chambers) and fluorescence (multi-element Ge-detectors). At such low energies as 1.5 keV for Al-K, the sample needs to be in vacuum, transmission will not work and Ge detectors probably the same. Does anybody have experience with Al-EXAFS, and can share a little about setup and what other complications to expect?
Thank you, Alex. _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
Hi Alex, I have make Al K-edge measurements before. Unfortunately, the beamline is no longer available. It was Jumbo (BL III-3) at SSRL. At least, I don't think that Jumbo came back after the upgrade. I have made Total Electron Yield, Partial Electron Yield (Auger), and Fluorescence measurements on both conductive and non-conductive samples. I used an AXUV300 diode from http://www.ird-inc.com/axuvabsdev/axuv300mg.html. The diode is visible light sensitive so either the chamber must be light tight or it must be covered by 1 um of Al. I got the Al foil from Lebow http://www.lebowcompany.com/. This will certainly work for you if you can find a beamline, if I remember we used the YB66 crystals at Jumbo. You might contact the SRC to see if the Canadian Double Crystal monochromator can go low enough to catch Al. You are correct that the sample needs to be vacuum compatible. A low energy Ge detector with a thin C window should be able to detect Al as well. Jeff Jeff Terry Assoc. Professor of Physics Life Science Bldg Rm 166 Illinois Institute of Technology 3101 S. Dearborn St. Chicago IL 60616 630-252-9708 terryj@iit.edu On Oct 11, 2011, at 9:47 AM, Kompch, Alexander wrote:
Dear all,
for the analysis of the location of the Al-dopant in ZnO, I am looking for suitable EXAFS beamlines. Dopant concentrations are 1-10%. So far I have only found ALS 6.3.1 and NSLS X15B. Can anybody recommend beamlines for Al EXAFS?
My EXAFS experience is so far limited to the high energy range with signal detection in transmission (ionization chambers) and fluorescence (multi-element Ge-detectors). At such low energies as 1.5 keV for Al-K, the sample needs to be in vacuum, transmission will not work and Ge detectors probably the same. Does anybody have experience with Al-EXAFS, and can share a little about setup and what other complications to expect?
Thank you, Alex. _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
Hi Alex, you could also try beamline I511-3 at MAX-lab, Sweden. I did some Al K-edge XAS in fluorescence yield there but TEY is also possible for conducting samples. The sample was simply glued to the sample holder with carbon tape. Since the Al K-edge energy is close to the upper limit of the beamline, good EXAFS measurements would probably take some time, though. Cheers, Annette On 2011-10-11 16:47, Kompch, Alexander wrote:
Dear all,
for the analysis of the location of the Al-dopant in ZnO, I am looking for suitable EXAFS beamlines. Dopant concentrations are 1-10%. So far I have only found ALS 6.3.1 and NSLS X15B. Can anybody recommend beamlines for Al EXAFS?
My EXAFS experience is so far limited to the high energy range with signal detection in transmission (ionization chambers) and fluorescence (multi-element Ge-detectors). At such low energies as 1.5 keV for Al-K, the sample needs to be in vacuum, transmission will not work and Ge detectors probably the same. Does anybody have experience with Al-EXAFS, and can share a little about setup and what other complications to expect?
Thank you, Alex. _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
-- ------------------------------------------------------------------ Annette Pietzsch phone: +46-46-2228144 MAX-lab mobile: +46-709-323673 Lund University fax: +46-46-2224710 Visiting Address: Ole Römers väg 1 SE-221 00 LUND, Sweden Postal/Delivery Address: Box 118 SE-221 00 LUND, Sweden Invoice Address: Box 188 SE-221 00 LUND, Sweden VAT#: SE 2021 0032 1101 ------------------------------------------------------------------
Just a quick thank you to Anette, Jeff, Matt Dariusz and Lachlan for you help and advise on planing Al-K EXAFS. I now have good starting point for further planing. Cheers, Alex.
participants (6)
-
"Dr. Dariusz A. Zając" -
Annette Pietzsch -
Jeff Terry -
Kompch, Alexander -
Lachlan MacLean -
Matt Newville