[Ifeffit] Fitting Problems via Artemis

hsnuboy at ksu.edu hsnuboy at ksu.edu
Fri Sep 24 14:52:42 CDT 2004

Dear All,

Greeting.This is Yu-Chuan. After struggling a long time, I just felt a
little bit progress in the fitting program. However, there are still
some questions confused me.

1. What's the meaning and purpose of "Fit Background" in Artemis? I know
the backgound as "bare atom" in EXAFS theory. So, what kind of
situation we need to use this function?

2. Is that possible for the Debye-Waller factor(sigma^2) be negative?
Actually, I am not so sure about the physical meaning for that. Just
know its a kind of thermal vibration.

3. Sometimes, The results obtained from Artemis seems not the same.
Says, the guess parameters and uncertainties may be varied even if you
input the same data for different time.Has anyone met this problem

Sincerely yours,

Yu-Chuan Lin
Graduate Student and Reseach Assistant
Kansas State University

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