30 Dec
2009
30 Dec
'09
6:17 p.m.
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