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October 10, 2025The Journal of Physical Chemistry AOpen Access

First Direct Observation of Equilibrium Involving Cl Atoms: Cl + C2H4 ⇔ ClCH2CH2 by VUV Monitoring

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Authors

MBMark A. BlitzTSThomas H. SpeakPSPaul W. Seakins

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Overview

Time-resolved experiments show equilibrium and kinetics of Cl and ethylene, indicating significant reaction characteristics.

Key Points

  • The study reports the first direct observation of Cl atoms during the reaction with ethylene, establishing a kinetic framework for analysis.
  • Analysis indicates that the equilibrium reaction Cl + C2H4 ⇔ Cl–C2H4 shows complex dynamics, allowing estimation of the enthalpy of reaction at −74.1 ± 0.6 kJ mol–1.
  • Including ab initio calculations provided a deeper understanding of the reaction mechanisms and transition state energy variances with temperature.
  • The kinetics analysis suggests that Cl + C2H4 reactions change from simple association to abstraction with increasing temperature, emphasizing temperature dependency.

Cite This Study

Blitz et al. (2025) studied this question.

synapsesocial.com/papers/68e9435d2d5336d28fb28940https://doi.org/10.1021/acs.jpca.5c05430
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