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Fig. 1
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Ground state and first excited energy levels of the 2Π3∕2 OD, OH, and 2Π1∕2 OH states. Greyarrows mark the transitions discussed in this study, whose frequencies are given at the bottom. The zero level of the energy scale refers to the vibrational ground states (2658 and 1941 K for OH and OD, respectively).
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