Calculations of the Second Hyperpolarizability

CNDO/S level. A representative selection of work using current ab initio methods is included among the papers reviewed in Section 5. 

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Ruud et a/.164 have attempted to introduce an integral screening procedure into direct SCF calculations of the second hyperpolarizabilities of large molecules. The screening simulates the correlation effects that are implicit macroscopically in the introduction of a dielectric constant. The introduction... 

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