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Unrestricted Hartree-Fock
Unrestricted Hartree-Fock (UHF) theory is the most common molecular orbital method for open shell molecules where the number of electrons of each spin are not equal. While restricted Hartree-Fock theory uses a single molecular orbital twice, once multiplied by the α spin function and once multiplied by the β spin function in the Slater determinant, unrestricted Hartree-Fock theory uses different molecular orbitals for the α and β electrons.
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