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A theoretical study on the dynamics of gas-phase reaction of methyl cation with atomic oxygen

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Abstract

The dynamics and kinetics of the reaction of CH3+ cation with atomic oxygen in its lowest triplet and singlet states in the presence of N2 molecules as the bath gas is theoretically investigated. The potential energies over both surfaces at the CCSD(T)/aug-cc-pVTZ level of theory are explored. Both singlet and triplet surfaces characterize by barrierless initiation step. The entrance channel to form the energized adducts are governed by the capture probability once the centrifugal barrier is surmounted. Multiwell-multichannel mechanisms are found for both singlet and triplet potential energy surfaces. One-dimensional chemical master equation is solved to explore the dynamics and kinetics of the title reaction. The fractional populations of the stationary points as function of time are analyzed to determine the role of the energized intermediates on the dynamics of the title reaction. No significant temperature or pressure dependence for the title reaction was observed over a wide range of temperature (300–3000 K) and pressure (0.1–4.5 atm). The results indicate cis and trans-HCOH+, CH2O+, and H atom are the major products for both surfaces. CVT method was used to explore the importance of tunneling in hydrogen transfer isomerization reactions of CH2O+ to trans-HCOH+ and HOC+ to HCO+ using small-curvature approximation.

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Acknowledgements

The financial support from the Research Council of Shiraz University is acknowledged.

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Authors and Affiliations

  1. Department of Chemistry, College of Science, Shiraz University, Shiraz, Iran

    Samaneh Mousavi & Seyed Hosein Mousavipour

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  1. Samaneh Mousavi
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Correspondence to Seyed Hosein Mousavipour.

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13738_2018_1558_MOESM1_ESM.docx

In Supporting Information file the IRC graphs for the 15 corresponding reactions are included. The variation of vibrations along the reaction coordinate and also corresponding MEPs and Ground-state vibrationally adiabatic potentials VGa(s) for reactions R7, R9, and R11 are included. (DOCX 459 KB)

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Mousavi, S., Mousavipour, S.H. A theoretical study on the dynamics of gas-phase reaction of methyl cation with atomic oxygen. J IRAN CHEM SOC 16, 807–825 (2019). https://doi.org/10.1007/s13738-018-1558-x

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