[Ifeffit] Lattice parameters: EXAFS vs. XRD

Scott Calvin SCalvin at slc.edu
Wed Dec 30 12:17:26 CST 2009

Thanks, Matt--you give a complete and satisfying discussion of this on  
January 23 on this list. I forgot about that because it came at the  
tail end of a long discussion as to whether C3 could ever be 0, but I  
suspect what you said then was rattling around in the back of my head  
and only settled in last week.

--Scott Calvin
Sarah Lawrence College

On Dec 30, 2009, at 8:47 AM, Matt Newville wrote:

> Hi Scott,
> I believe we had a conversation about this last January.
> XAFS is not sensitive to the crystallographic lattice constants.  It
> measures the spacing between atoms.  Because of thermal vibrations and
> other disorder terms, the average distance between atoms is larger
> than the distance between the lattice points.
> --Matt

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