Direct Trace Fitting of Experimental Data Using the Master Equation: Testing Theory and Experiments on the OH + C2 H4 Reaction

The Journal of Physical Chemistry. a
Diogo J MedeirosP W Seakins

Abstract

Laser flash photolysis coupled with laser induced fluorescence observation of OH has been used to observe the equilibration of OH + C2H4 ↔ HOC2H4 over the temperature range 563 - 723 K and pressures of bath gas (N2) from 58 - 250 Torr. The time-resolved OH traces have been directly and globally fitted with a master equation in order to extract ∆_R H_0^0, the binding energy of the HOC2H4 adduct, with respect to reagents. The global approach allows the role that OH abstraction plays at higher temperatures to be identified. The resultant value of ∆_R H_0^0,111.8 kJ mol-1, is defined to better than 2 kJ mol-1, and is in agreement with our ab initio calculations (carried out at the CCSD(T)/CBS//M06-2X/aug-cc-pVTZ level), of 111.4 kJ mol 1, and other state of the art calculations. Parameters for the abstraction channel are also in good agreement with previous experimental studies. To effect this analysis, the MESMER master equation code was extended to directly incorporate secondary chemistry: diffusional loss from the observation region and reaction with the photolytic precursor. These extensions, which, among other things, resolve issues related to the merging of chemically significant and internal energy relaxation eigenvalues, ar...Continue Reading

References

Mar 3, 2006·The Journal of Physical Chemistry. a·Mark A BlitzStruan H Robertson
May 26, 2006·The Journal of Physical Chemistry. a·Juan P SenosiainJames A Miller
Jul 13, 2006·The Journal of Physical Chemistry. a·Erin E GreenwaldStephen J Klippenstein
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Aug 10, 2007·Physical Chemistry Chemical Physics : PCCP·M Teresa Baeza-RomeroPaul W Seakins
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Aug 22, 2012·The Journal of Physical Chemistry. a·David R GlowackiStruan H Robertson
Feb 26, 2013·Physical Chemistry Chemical Physics : PCCP·James A Miller, Stephen J Klippenstein
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Apr 25, 2017·Physical Chemistry Chemical Physics : PCCP·Hongmiao WangStruan H Robertson
Jul 7, 2017·Physical Chemistry Chemical Physics : PCCP·Karlheinz HoyermannThomas Zeuch

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Citations

May 26, 2021·The Journal of Physical Chemistry. a·Yanice BenitezRobert E Continetti
Oct 28, 2021·The Journal of Physical Chemistry. a·Mark A BlitzThomas H Speak
Feb 15, 2022·Physical Chemistry Chemical Physics : PCCP·Juan SotoDaniel Peláez

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