The photoionization spectrum of CSe2 has been studied with 0.15 Å resolution. Autoionization from four series of Rydberg states converging on three limits have been analyzed, yielding the following state energies for CSe2+:X2Πg,1/2, 9.524 eV; B2Σu+, 13.6336 eV; and C2Σg+, 15.899 eV. A spin–orbit splitting of 0.266±0.002 eV for the X state is deduced. The symmetry of the Rydberg states is inferred from quantum defects. From the threshold for Se+ formation, a best combination of ΔHf,298(CSe2,g) =+62.0 kcal/mole and D0(CSe) =135±2 kcal/mole is deduced. The onset for CSe+ yields I.P. (CSe) ?10.943 eV. The possible mechanisms for fragmentation are discussed.
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Rädler et al. (1977) studied this question.
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