[Ifeffit] Solid AuCl EXAFS fitting – big N

[Sin Yuen Chang]

Many thanks for the response, Bruce. 

> For something as tricky as Au(1+) chloride, I think it is unwise to 
> blindly trust data that you found in some disreputable corner of the 
> internet.  It really seems like the kind of thing you need to measure 
> for yourself if you want confidence in what you have.

Exactly what I am working on!

Best regards,
Sin-Yuen

-----Original Message-----
From: ifeffit-bounces at millenia.cars.aps.anl.gov [mailto:ifeffit-bounces at millenia.cars.aps.anl.gov] On Behalf Of Bruce Ravel
Sent: 27 June 2014 16:40
To: XAFS Analysis using Ifeffit
Subject: Re: [Ifeffit] Solid AuCl EXAFS fitting – big N

On 06/27/2014 01:14 AM, Sin Yuen Chang wrote:
> Given how many times AuCl XANES has been published before, has anyone 
> else perhaps run into this problem? Has anyone perhaps measured solid 
> AuCl under exclusion of moisture and air, or several times as a 
> function of time to assess beam damage?
>

I was under the impression that *everyone* runs into that problem.  As you say Au(1+) chloride is quite unstable.  Given that the white line in the data that you took from my LCF fitting example is so close in size to that of Au(3+) chloride, I would guess that the sample was no pure Au(1+) by the time we measured it.

For something as tricky as Au(1+) chloride, I think it is unwise to blindly trust data that you found in some disreputable corner of the internet.  It really seems like the kind of thing you need to measure for yourself if you want confidence in what you have.

B

--
  Bruce Ravel  ------------------------------------ bravel at bnl.gov

  National Institute of Standards and Technology
  Synchrotron Science Group at NSLS --- Beamlines U7A, X24A, X23A2
  Building 535A
  Upton NY, 11973

  Homepage:    http://xafs.org/BruceRavel
  Software:    https://github.com/bruceravel
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