We have measured the photodissociation of few-keV OD molecular ions into either D + O or O + D final products. The three-dimensional momentum imaging measurements of the light and massive fragments in coincidence were enabled by using an upgraded two-detector setup. In this work, we show that absorption of a single 790 or 395 nm photon excites the OD from its electronic ground state to the B state, which dissociates to the O(S) + D dissociation limit. To reach the other nearly degenerate dissociation limit, D + O(P), a unimolecular charge transfer, B to X , transition is required following the same photoexcitation. The measured branching ratio of these dissociation channels is a direct measure of the charge transfer transition probability. This measured probability as a function of energy above the dissociation limit agrees well with our calculations.
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| http://dx.doi.org/10.1021/acs.jpclett.4c00649 | DOI Listing |
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