[Ifeffit] book chapter

[Hashem Stietiya]

Dr. Kelly,

I would be thrilled if you could send me a copy. 

Thank you,

Hashem Stietiya
Louisiana State University

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Subject: Ifeffit Digest, Vol 71, Issue 16

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Today's Topics:

   1. Re: distinguishing between actual shells and artifacts
      (Kelly, Shelly)


----------------------------------------------------------------------

Message: 1
Date: Wed, 14 Jan 2009 13:58:21 -0700
From: "Kelly, Shelly" <Shelly.Kelly at uop.com>
Subject: Re: [Ifeffit] distinguishing between actual shells and
	artifacts
To: "XAFS Analysis using Ifeffit" <ifeffit at millenia.cars.aps.anl.gov>
Message-ID:
	
<5A8CCCCD35FC0946BE602D2F43C0218A7DF9FF at AZ18EV808.global.ds.honeywell.com>
	
Content-Type: text/plain;	charset="iso-8859-1"

Hi Hashem,

I show one method for doing this in my book chapter Figure 14-23 on page
431. (I feel a bit like a broken record).  I will send you a copy if you
want.

Shelly

> -----Original Message-----
> From: ifeffit-bounces at millenia.cars.aps.anl.gov [mailto:ifeffit-
> bounces at millenia.cars.aps.anl.gov] On Behalf Of Voegelin Andreas
> Sent: Wednesday, January 14, 2009 9:57 AM
> To: XAFS Analysis using Ifeffit
> Subject: Re: [Ifeffit] distinguishing between actual shells and artifacts
> 
> Hi Hashem
> 
> You can copy-paste the respective EXAFS data in Athena and compare the
> backtransforms over the first shell, the first+second shell, the second
> shell.
> 
> By comparison of the backtransforms with each other and with the measured
> EXAFS, you can see where the second-shell contribution has its origin in
> k-space (note that the backtransform is not corrected for the window
> function).
> 
> For instance, if the second-shell signal adds to the spectrum in the low-k
> range (where noise should not be a problem), it is likely real and might
> result, e.g., from multiple scattering among first-shell O atoms. If the
> second-shell signal in the backtransform mainly contributes in the high-k
> range (where noise or glitches may be a problem), you may be able to see
> whether it falls together with obvious artefacts (such as glitches), or
> whether the backtransform matches spectral features that you consider to
> be real.
> 
> Andreas
> 
> -----------------------------------------------
> Andreas Voegelin, PhD
> Soil Chemistry Group
> Inst. of Biogeochemistry and Pollutant Dynamics
> Dept. of Environmental Sciences
> ETH Zurich
> Universit?tstrasse 16, CHN F24
> CH-8092 Z?rich, Switzerland
> Phone: +41 44 633 61 47
> Fax: +41 44 633 11 18
> E-Mail: voegelin at env.ethz.ch
> www: http://www.ibp.ethz.ch/people/andreavo
> 
> 
> 
> > -----Original Message-----
> > From: ifeffit-bounces at millenia.cars.aps.anl.gov
> > [mailto:ifeffit-bounces at millenia.cars.aps.anl.gov] On Behalf
> > Of mstiet2 at lsu.edu
> > Sent: Mittwoch, 14. Januar 2009 14:12
> > To: ifeffit at millenia.cars.aps.anl.gov
> > Subject: [Ifeffit] distinguishing between actual shells and artifacts
> >
> > Dear all,
> >
> > I am currently fitting first and second shells with Zn-O and
> > Zn-Zn paths,respectively. I get second shell features that
> > could be fit quite well, but I am not certain if they are
> > actually second shell features or possibly artifacts. For
> > some samples I get second shell features that I know should
> > not be present. What criteria would you use to distinguish
> > between artifacts and actual shells?
> >
> > Your assistance is appreciated.
> >
> > Hashem Stietiya
> >
> > Louisiana State University
> >
> >
> >
> 
> _______________________________________________
> Ifeffit mailing list
> Ifeffit at millenia.cars.aps.anl.gov
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