Some reasons not to use spin projected density functional theory
- 15 October 1996
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 105 (15) , 6574-6577
- https://doi.org/10.1063/1.472497
Abstract
Spin unrestricted calculations using density functional theory can yield wave functions with spin contamination. In conventional post Hartree–Fock calculations (such as Mo/ller–Plesset perturbation theory), spin projection can ameliorate some of the problems caused by spin contamination. However, spin projection can seriously degrade the quality of potential energy surfaces calculated by density functional methods, just as spin projection can yield poor results for Hartree–Fock potential energy surfaces.Keywords
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