Spin Multiplicity of Electronic States

The electronic state of a molecular orbital is specified by its spin multiplicity. Spin multiplicity is determined from the equation, [Pg.186]

A ground-state helium atom has a pair of electrons of opposite spin in the 1 s [Pg.187]

the ground-state singlet Sq has spin multiplicity of 1. [Pg.187]

In the lower excited state (5i and Tj) of helium atom, there are two possible spin configurations [Pg.187]

its spin multiplicity is I. In the T state, total spin S = Yi + Vi = I and hence its spin multiplicity is 3. [Pg.187]

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