in Table 12.4. The corresponding set of levels are found for the excitonic configuration h9uf^g except for a parity change for all orbital levels of the multiplet. Table 12.4 in addition lists Pauli-allowed states for all symmetry types that are possible starting with optical excitation from the Qo HOMO denoted by h1°. The Jahn-Teller distortion associated with the lowest-lying %g state arising from the h9uftu multiplet has been calculated by several groups [12.35].

As another illustration of excited configurational states, we consider the excitonic states for the C^ ion. In this case we can excite an electron from the f?u configuration to a higher-lying configuration ffuflg or to a yet higher-lying configuration such as ffJiu- The corresponding doublet and quartet Pauli-allowed states (5 = 1/2 and S = 3/2) for these and many other configurations are listed in Table 12.5, following the same notation

States for the C^ anion allowed by the Pauli principle.




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