Ab initio UHF calculations. Part 8.—Spin contamination in the cyanide radical
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 68, 566-574
- https://doi.org/10.1039/f29726800566
Abstract
Ab initio UHF calculations on the cyanide radical have been extended to reduce the excessive amount of spin contamination which is sometimes characteristic in the UHF method. The “spin constrained UHF method” minimizes the function αEUHF+(1–α)〈S2〉UHF for values of α between 0 and 1, to produce UHF-type wave functions. The coefficients of the contaminating spin states are determined for selected values of α. By an extrapolation procedure the hyperfine coupling constants arising from the doublet-state component of the UHF wave function (α= 1) are estimated to be a(13C)= 238 G and a(14N)=–4.2 G.Keywords
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