Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 28, Pages 6582-6588Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c01932
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Funding
- U.S. Department of Energy Office of Science, Office of Basic Energy Sciences [DE-SC0015997, DE-SC0019740]
- U.S. National Science Foundation [CHE1566636]
- Alexander von Humboldt Foundation
- National Natural Science Foundation of China [21733006]
- National Key Research and Development Program of China [2017YFA0206500]
- University Cooperation and Innovation Program of Anhui Province [GXXT 2020-004]
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The dissociation dynamics of the nonadiabatic predissociation system HCO is strongly modulated by parent rotational quantum numbers, leading to a unique purely quantum mechanical behavior. The appearance of vibrational ground and excited states of CO product is attributed to the dependence of vibronic resonance lifetime on parent rotational angular momentum quantum numbers coupled with transient intensity borrowing.
By examining the product-state distribution of a prototypical nonadiabatic predissociation system, HCO((A) over tilde (2)A ''-X(2)A'), we demonstrate that the dissociation dynamics is strongly modulated by parent rotational quantum numbers. The predissociation of the nominal (nu(C-H) = 0,nu(bend), nu(C-O) = 1) vibronic levels of the (A) over tilde 2A '' state surprisingly gives rise to both vibrational ground and excited states of the CO product, despite the assumed spectator nature of the CO moiety. This anomaly is attributed to the dependence of the lifetime of the vibronic resonance facilitated by the Renner-Teller interaction on the parent rotational angular momentum quantum numbers coupled with transient intensity borrowing from nearby vibronic resonances with nu(C-O) = 0. This unique phenomenon is a purely quantum mechanical behavior that has no classical analogue.
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