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In order of increasing energy, the outermost orbitals associated only with the CÀ ÀS chromophore are (s), (n0 ), (p), (n), (p*), and (s*), where n is the thiocarbonyl nonbonding orbital, and n0 a second nonbonding orbital, (chlorine orbitals are excluded). The electronic configuration of the ground state can be written (s)2(n0 )2(p)2(n)2(p*)0(s*)0, where each of the inner orbitals are doubly occupied by an electron pair and the outer orbitals (virtual) are empty. 2. The p, n, p*, and s* molecular orbitals that create the X 1 1 1 ~ ~ A2(n,p*), B A1(p,p*), and C B2(n,s*) states along with the first three low-energy singlet-singlet transitions.