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spin projection

A component, M S, of the angular spin moment S along an arbitrary axis (usually chosen as the z-direction). M S can take the values between − S and S: − S, − S + 1,..., S − 1, S. The term is also used to denote an operation (spin-symmetry projection) allowing one to eliminate spin contamination in the cases where wavefunctions are not eigenfunctions of the operator S 2.
PAC, 1999, 71, 1919 (Glossary of terms used in theoretical organic chemistry) on page 1963
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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