Question

The number of distinct values of this quantity appears in the superscript of term symbols. This quantity changes in phosphorescence, (0[1])but not fluorescence, (20[2])in an example (20[1])of (20[1])intersystem crossing. Antisymmetric wavefunctions (20[1])are often written as Slater determinants (0[1])of constructs named for this quantity. (20[3])This quantity and one symbolized L interact in the Russell-Saunders (20[1])scheme of a "coupling" named for this quantity (20[1])and (*) "orbit." (10[1]0[1])The (10[1])multiplicity (10[1])of this quantity (10[2])is maximized when filling orbitals using Hund's (10[4])rule. (10[2])Due to the (10[1])Pauli exclusion principle, (10[3])this (10[1])quantity must be paired (10[2])for the (10[1])two electrons (10[1])in the same (10[1])orbital. (10[1]0[1])For 10 points, name this quantity that, for an electron, is symbolized with an up or down arrow. ■END■ (10[3])

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