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Imaging a Resonance-Dominant Polyatomic Reaction: F + CH3D → CH3(ν2 = 2) + DF(ν)
Surjendu Bhattacharyya1, Sohidul Mondal1, Kopin Liu1,2
1Institute of Atomic and Molecular Sciences (IAMS) , Academia Sinica , P.O. Box 23-166, Taipei , 10617 , Taiwan.
The Journal of Physical Chemistry Letters
|September 7, 2018
Summary
This study reveals that the title reaction primarily occurs through a resonance-mediated pathway, unlike similar reactions that favor direct abstraction. This finding advances our understanding of complex reaction dynamics and resonance mechanisms.
Area of Science:
- Chemical Dynamics
- Molecular Scattering
- Reaction Mechanisms
Background:
- Previous studies on isotopically analogous reactions indicated a dominant direct abstraction pathway.
- Understanding complex reaction dynamics is crucial for chemical kinetics.
Purpose of the Study:
- To investigate the reaction mechanism of the title reaction using crossed-beam scattering.
- To determine the role of resonance-mediated pathways in this six-atom reaction.
- To compare the observed mechanism with previous findings in analogous reactions.
Main Methods:
- Crossed-beam scattering experiment with collisional energy (Ec) from 0.46 to 4.53 kcal mol⁻¹.
- Time-sliced velocity-imaging technique to measure pair-correlated integral and differential cross sections.
- Analysis of state-specific excitation functions and product angular distributions.
Main Results:
- The title reaction predominantly proceeds via a resonance-mediated pathway.
- Observed structures in excitation functions and Ec evolution of angular distributions support this mechanism.
- Complex scattering resonances were identified in this six-atom reaction.
Conclusions:
- The predominant mechanism differs from the direct abstraction pathway often observed in analogous reactions.
- Understanding isolated resonances in benchmark reactions aids in explaining complex overlapped resonances.
- This study provides insights into the formation and decay of scattering resonances.
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