I'd like to add my 2cents worth about the mean square displacement term. I wrote it up on the EXAFS wiki, since I like to say it over and over. see http://www.xafs.org/Common_Mistakes Shelly ________________________________ From: ifeffit-bounces@millenia.cars.aps.anl.gov on behalf of Scott Calvin Sent: Wed 7/16/2008 3:54 PM To: XAFS Analysis using Ifeffit Subject: Re: [Ifeffit] quotation of figures Hi Rich, "Mean-square radial disorder" (MSRD) is one good alternative. I'll also point out another bit of ambiguity with "Debye-Waller factor" aside from the confusion with the XRD term. Some EXAFS practitioners use Debye-Waller factor to indicate all disorder-type modifications to the EXAFS equation, including higher cumulants. Most use it only for the Gaussian part; i.e. the second cumulant. Another good reason to avoid the term. --Scott Calvin Sarah Lawrence College On Jul 16, 2008, at 4:41 PM, Richard Mayes wrote:
I also dislike the phrase "Debye-Waller factor" for the exafs disorder term. In crystallography, the Debye-Waller factor refers to disorder of atoms about their lattice positions. In exafs, the disorder is about the path length of the N-body configuration -- clearly not the same thing. I am, apparently, in the minority on this topic -- "Debye-Waller factor" is in wide use in the exafs literature. But, as everyone here knows, I often like to stand up on my soapbox and yell into the crowd. ;-)
Bruce,
While you're on your soapbox, if we drop "Debye-Waller factor" to describe the EXAFS disorder term, would you suggest using only "disorder" or do you have a better phrase to use?
Rich
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