[Ifeffit] quotation of figures

[Kelly, Shelly D.]

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 at 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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