The spinhyphen;orbit contribution to the zerohyphen;field splitting of the oxygen molecule is calculated using the complete spinhyphen;orbit Hamiltonian. All calculations are performed at the equilibrium internuclear distanceRequals;2.282thinsp;a.u.The spinhyphen;orbit contribution toDis found to be 0.3125 cmminus;1which is about 7percnt; of the totalDvalue.
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