Hexafluorobenzene as a temperature probe and as a sensitizer in the CO/sub 2/-laser-induced decomposition of cyclobutanone

Journal Article · Thu Mar 31 04:00:00 EST 1983 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100230a009· OSTI ID:5727912

Selamoglu, N; Steel, C

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.

• Research Organization: Brandeis University, Waltham, MA
• OSTI ID: 5727912
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 87:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AROMATICS
BENZENE
CARBON DIOXIDE LASERS
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY LEVELS
EXCITED STATES
FLUORINATED AROMATIC HYDROCARBONS
FLUORINE COMPOUNDS
GAS LASERS
HALOGEN COMPOUNDS
HALOGENATED AROMATIC HYDROCARBONS
HYDROCARBONS
KETONES
LASERS
MONITORING
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHYSICAL PROPERTIES
SPECTRA
TEMPERATURE DEPENDENCE
TEMPERATURE MONITORING
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
ULTRAVIOLET SPECTRA