Multidimensional H-Atom Tunneling Dynamics of Phenol: Interplay between vibrations and tunneling

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Multidimensional facets of the hydrogen tunneling dynamics of phenol excited in S1 (ππ*) have been unraveled to give particular S1 vibronic states strongly coupled or actively decoupled to the O–H tunneling coordinate. Strong mode-dependent variation of the tunneling rate measured with picosecond lasers indicates that tunneling probability is extremely sensitive to low-frequency vibrational modes seemingly orthogonal to the O–H elongation coordinate unless the rate of energy randomization exceeds that of tunneling. The multidimensional nature of tunneling has also been manifested in efficient internal-to-translational energy transfers observed at S1 vibronic modes strongly coupled to the tunneling coordinate, giving insights into otherwise the formidable multidimensional map of tunneling process. The nonadiabatic bifurcation dynamics in the later stage of the chemical reaction has been disentangled by analyzing picosecond time-resolved product state distributions, resolving a long controversial issue regarding the origin of high or low kinetic energy component of the product translational energy distributions.
Publisher
AMER CHEMICAL SOC
Issue Date
2019-02
Language
English
Article Type
Article
Citation

JOURNAL OF PHYSICAL CHEMISTRY A, v.123, no.8, pp.1529 - 1537

ISSN
1089-5639
DOI
10.1021/acs.jpca.9b00327
URI
http://hdl.handle.net/10203/253017
Appears in Collection
CH-Journal Papers(저널논문)
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