I don't know about surface CO, but I do know that in metal carbonyls, you get a very strong scattering from the distal atom, let's say the O in M-C=O, due to the focusing from the intermediate atom. Thus, if you really have a monolayer-selective method for doing EXAFS, e.g. partial Auger yield, then you may be able to see the CO. mam On 9/5/2012 8:12 PM, Zhaomo Tian wrote:
Hi,Jason! I think you are really professional and pointed out the most important point at the beginning !
Actually I am really worried about my experiment too, I also have a doubt about whether I can see C or O contributions to the EXAFS in my sample.But I think maybe no one can give the answer for sure. So at least I need to try first and see. Actually the originality of my work is to study the electrochemical reduction of CO2 on metal electrodes. Since CO is noticed as an important adsorbed intermediate in the multistep reaction and only copper has been found to be unique among the metals in its ability to produce a high quantities of hydrocarbon fuels, i start to first investigate the interaction between adsorbed CO and copper.Thats why I believe that using EXAFS to study the chemisorbed CO gas-copper system will contribute to some reasonable explanation.
I sent you two references, in the first one there is evidence for CO adsorbed Ru taken at Ru k-edge,where CO is observed in EXAFS, and the second one SEXAFS study on CO adsorbed on Cu, but it is taken at oxygen K edge.I think even if there is not exact the same evidence with my system which is EXAFS on Cu k-edge of CO adsorbed Cu, but it may still work. Why do you think my experiment is not promising? Could you please explain some reasons to me? Is there any conditions for metal and adsorbed gas that their EXAFS signal can be detected? If there are,would you please to give me some modification of my experiment?
Thanks a million.
Best Regards,
------------ Original Message ------------ From : ifeffit-request@millenia.cars.aps.anl.gov To : ifeffit@millenia.cars.aps.anl.gov Mail Subject : Ifeffit Digest, Vol 115, Issue 2 Sent : Wed, 05 Sep 2012 08:25:57 -0500
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Today's Topics:
1. Ratio of peak amplitudes in R-space (Rana, Jatinkumar Kantilal) 2. Re: Ratio of peak amplitudes in R-space (Christopher Patridge) 3. Re: Ratio of peak amplitudes in R-space (Scott Calvin) 4. How to write feff.inp file for CO adsorbed Cu? (Zhaomo Tian) 5. Re: How to write feff.inp file for CO adsorbed Cu? (Jason Gaudet)
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Message: 1 Date: Wed, 5 Sep 2012 12:01:01 +0000 From: "Rana, Jatinkumar Kantilal"
To: "ifeffit@millenia.cars.aps.anl.gov"
Subject: [Ifeffit] Ratio of peak amplitudes in R-space Message-ID: Content-Type: text/plain; Zharset="us-ascii"
Dear Ifeffit community,
I was wondering If I can make a qualitative comparison about the amplitude ratio of first two shells for various states of same sample ?
For example, I have a sample which is measured at various states, say A, B, C, D and E during any physical or chemical process.
I get systematic change in the ratio of first two peaks at each state. This could be interpreted either as change in disorder or as change in number of atoms associated with first two shells as a result of any physical or chemical change material has undergone.
As we know that amplitude of peak decreases with increase in distance from central absorber.
Can I compare the amplitude ratio of first two peaks for various states of same sample ??
Many thanks in advance !!!
With best regards, Jatin
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