[Ifeffit] Linear combination of Sigma ^ 2
pmzl at leeds.ac.uk
pmzl at leeds.ac.uk
Thu Feb 28 07:33:41 CST 2013
Dear all,
I am following Bruce’s video presentation on the Artemis case of FeS2, and have a beginner’s question here.
There is a configuration of S1 ---- Fe ---- S2 .
In order to use the existing sigma^2 defined for single scattering path of [Fe – S], Bruce applied linear combination for the following paths:
Fe ---- S1 ---- S2 ---- Fe Sigma^2 of this path = sigma^2 [Fe – S] *2
Fe ---- S1 ---- Fe ---- S2 ---- Fe Sigma^2 of this path = sigma^2[Fe – S) *2
Fe ---- S1---- Fe ---- S1 ---- Fe Sigma^2 of this path = sigma^2 [Fe – S] *4
Hence the question is, why the third path multiplies 4 while the other two paths multiply 2? For me they should all be 2.
Thanks.
Regards,
Zhipeng
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