INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
Temperature and Pressure Dependence of the Reaction 2 CF3 (+ M) =C2F6 (+ M)
Autor/es:
C. J. COBOS; A. E. CROCE; K. LUTHER; J. TROE
Revista:
JOURNAL OF PHYSICAL CHEMISTRY A
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2009 vol. 114 p. 2748 - 2754
ISSN:
1089-5639
Resumen:
Limiting low- and high-pressure rate coefficients as well as full falloff curves have been modeled by
unimolecular rate theory for the recombination reaction 2CF3 (+ M) f C2F6 (+ M) and the reverse dissociation
of C2F6. The results are compared with experimental data from the literature. Although there are considerable
discrepancies (up to a factor of 5) between various experimental data near 300 K and the database for high
temperatures is still limited, we try to conclude on the temperature dependence of the high-pressure rate
coefficient. We suggest that there is only a small and probably positive temperature coefficient of the latter
quantity. The present theoretical modeling seems to be in agreement with this experimental result, but it is
in disagreement with conclusions from earlier theoretical work. The difference is attributed to different empirical
assumptions about the anisotropy of the potential. It is shown that nearly all previous experiments (except
high-temperature shock wave and very low pressure pyrolysis/photolysis experiments) correspond to nearly
limiting high-pressure conditions.