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The Spin keyword is used to specify the spin state of an unrestricted SCF calculation. The value of Spin is twice the z-component of the wave function, equal to the number of unpaired electrons.
If the spin is different than 0, then the calculation results in an excited state with the Spin value being the number of unpaired electrons.

If a value of 0 is provided, then DMol3 automatically determines the lowest spin occupation.
As a result of the above usage, it is not possible to use this keyword to force open-shell UKS singlet states to be singlets. Providing an input value of "0" tells DMol3 to optimize the spin state, not to freeze the value of the spin at a singlet state.

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