A new electronic state of water has been identified by three photon absorption (four photon ionization) spectroscopy. Rotational analysis of the bands associated with this new D̃′ state in both H2O (ν0=84 434±2 cm−1) and D2O (ν0=84 646±2 cm−1) show it to be of B1 symmetry. The nature of the electronic promotion giving rise to this D̃′ state is considered.
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Ashfold et al. (1983) studied this question.
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