[Ifeffit] temperature dependency of amp parameter
Matt Newville
newville at cars.uchicago.edu
Mon May 21 15:38:20 CDT 2018
Hi Abdul,
On Mon, May 21, 2018 at 3:24 PM Abdul Ahad <matrixabdulahad at gmail.com>
wrote:
> Hi all,
> I have little confusion that do i fix or change S2 for each data set
> measured at different temperature. The compound is not monoatomic so i used
> Einstein model for sigma2. What about amplitude S2.
> '
>
Generally speaking, S02 is independent of temperature, at least for a
system that is not changing state. That is, S02 is essentially an atomic
property. If you melt a material, you'll first change the coordination
number. Eventually (say 10,000 K) you might get to the point where you're
moving electrons out of the atom, and in a plasma, S02 may not be the same
as for low temperatures. But, when your sample is in a solid or liquid
state, S02 should not depend on temperature.
--Matt
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