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The 351 nm (hν=3.531 eV) photoelectron spectrum IO− shows transitions to two spin–orbit states of neutral IO. The electron affinity of IO is found to be 2.378(5) eV. Vibrational frequencies for the neutral (2Π1/2) and anion (1Σ+) states are reported. The spin–orbit splitting of the IO ground state is determined to be −2091(40) cm−1. Franck–Condon analysis of the IO vibrational progressions were used along with the previously determined 2Π3/2 molecular constants to obtain the equilibrium bond lengths of the anion (1Σ+) and neutral (2Π1/2) states.
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Gilles et al. (1991) studied this question.
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