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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 〈SA·SB〉, 〈SA2 〉, and mA and discussing the connection between these expected values and the Heisenberg spin model (HSM) and the Noodleman broken-symmetry approach...
On the basis of the calculations and analyses of the intrapair and interpair correlation energy of KX (X = OH, NC) molecules and the results of the transferability of both the innermost intrapair correlation energy and the inner core effect of K and X in KX molecules, we defined and calculated the Kδ+ and Xδ-correlation contributions to the total correlation energy of KX molecules. With the comparison...
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