[Ifeffit] reference

Kelly, Shelly D. SKelly at anl.gov
Thu Oct 30 11:42:48 CST 2003

Hello All,

Does anyone know of a reference that explicitly shows that sigma2 for a
linear backscattering path is approximately twice a single scattering

My example is for a uranyl moiety (UO2).  The structure of this moiety
is symmetric and linear with a dumbbell shape with O1=U=O2 all in a row.
I need a reference that does the calculation to show that the 4 leg path
(U-O1-U-O2-U) has a sigma2 value that is twice the single scattering
path (U-O1-U) from one of the oxygen atoms.  

Thanks for your help

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