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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Predictive a priori pressure-dependent kinetics.

Ahren W Jasper1, Kenley M Pelzer2, James A Miller2

  • 1Combustion Research Facility, Sandia National Laboratories, MS 9055, Livermore, CA 94551-0969, USA.

Science (New York, N.Y.)
|December 6, 2014
PubMed
Summary
This summary is machine-generated.

Predicting chemical reaction pressure dependence is crucial for combustion and atmospheric chemistry. This new method uses trajectory calculations and a master equation for accurate, a priori predictions, validated by experiments.

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Area of Science:

  • Chemical Kinetics
  • Computational Chemistry
  • Atmospheric Chemistry

Background:

  • Predicting pressure dependence of chemical reaction rates is vital for kinetic modeling.
  • This dependence is linked to energy (E) and angular momentum (J) transfer during collisions.

Purpose of the Study:

  • To develop a novel, a priori method for predicting pressure dependence of chemical reaction rates.
  • To move beyond empirical approaches in kinetic modeling.

Main Methods:

  • Coupling trajectory-based calculations of E,J-resolved collisional transfer rates.
  • Utilizing a two-dimensional master equation.
  • Obtaining microcanonical dissociation rates via ab initio transition state theory.

Main Results:

  • The developed method accurately predicts pressure dependence.
  • Predictions for CH4 = CH3 + H and C2H3 = C2H2 + H reactions show excellent agreement with experimental data.

Conclusions:

  • The new scheme offers a robust, non-empirical approach to predicting pressure-dependent reaction rates.
  • This advancement is significant for kinetic modeling in combustion and atmospheric chemistry.