Two-photon absorption spectroscopy with a mass-selected beam of CO+2 ions was used to study the predissociative C̃ 2Σ+g state of CO+2. The first photon pumped the à 2Πu←X̃ 2Πg transition and the second photon was used to scan through the C̃ 2Σ+g←à 2Πu transition. A rotational analysis of two bands in this spectrum has been made. The C̃ 2Σ+g state is linear with a C–O bond length of 1.1552(2) Å in the v=0 level.
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Wyttenbach et al. (1989) studied this question.
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