A local spin evaluation into the active site models of [2Fe2S] ferrodoxin [Fe<sub>2</sub>

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To test the feasibility of local spin theory of Davidson and Clark for ferrodoxin clusters, the models [Fe2S2(SR)4]2- (R=-H, -CH3) are chosen for evaluation. This purpose is realized by calculating the local spin expectation values 【S_A·S_B】, 【S_A~2
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