A ring polymer molecular dynamics study of the Cl + O3 reaction

Literature Information

Publication Date 2013-12-02
DOI 10.1039/C3CP54405B
Impact Factor 3.676
Authors

R. Pérez de Tudela, M. Menéndez, J. F. Castillo, F. J. Aoiz


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Abstract

We have performed ring polymer molecular dynamics (RPMD) calculations on the Cl + O3 → ClO + O2 reaction at temperatures ranging from 200 K to 400 K, and compared the results with previous theoretical studies and also with the available experimental data. This reaction presents a couple of features which makes it a particularly interesting and challenging case to be studied using RPMD. First, classically, this is essentially a barrierless reaction, with a saddle point located below the reactants. However, the free energy profiles along the reaction coordinate display small barriers due to the fact that the decrease in enthalpy from reactants to the TS is somewhat compensated by a decrease in entropy. To our knowledge this is the first time such a process is studied using this technique. Second, the transition state is located early in the reactant valley, therefore the inclusion of the recrossing correction in the RPMD calculations is crucial to determine rate coefficients. Regarding quantum effects, our calculations show that RPMD results are within the error bars of the purely classical ones. This implies that tunnelling is negligible in this reaction at the temperatures studied, not surprisingly for a system including oxygen and chlorine atoms, and that the zero point energies of reactants, transition state and products are practically the same. Finally, the rate coefficients presented in this work are in a fairly good agreement with the recommended experimental values, somewhat better than those obtained using other approaches.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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