Abstract
The CO/sub 2/-laser-induced (1023 cm/sup -1/,P44) decomposition of cyclobutanone (C/sub 4/H/sub 6/O, 0.4 torr) sensitized by hexafluorobenzene (C/sub 6/F/sub 6/, 8 torr) was studied in the fluence range 0.08-0.35J/cm/sup 2/. The strongly temperature-dependent UV absorption spectrum of C/sub 6/F/sub 6/ allowed for real-time monitoring of the heating and cooling of the laser-excited sensitizer by following absorbance changes at 265nm. Under the conditions of this study, cooling appears to be dominated by thermal conduction to the walls of the vessel. A thermal conductivity model using inhomogeneous energy deposition explains quantitatively the transient measurements as well as the fractional decomposition of C/sub 4/H/sub 6/O. The usefulness of such high-temperature reactors for obtaining kinetic data is discussed.
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