[Ifeffit] the exact edge position

[gabriel rosenblum]

Hi
I would like to know what is the exact way to find the
edge position of a sample, and I wonder If anyone can
help.
Currently, I analyze few samples with minor changes,
and I suspect those changes might affect edge shifts.
The different samples are absolutely aligned, and the
next step is to find the edge position of each, and
compare the shifts with respect to the reference.
When using ATHENA, a circle appears approximately
where the edge should be, whereas a different result
for the edge position appears when analyzing with
UWEXAFS package – by viewing the maximum point of the
first derivative of mu(E).
I would also like to know, what is the correct
definition of the edge position.
Thanks.
Gabi.


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