Application of the thermal lens technique to infrared multiple photon photochemistry. Estimation of transient temperatures in cyclobutanone

Journal Article · Thu Aug 28 04:00:00 EDT 1986 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100409a013· OSTI ID:5424394

Guckert, J R; Carr, R W

The thermal lens technique is applied to infrared multiple photon photochemistry of cyclobutanone at pressures from 1 to 10 Torr, where energy transfer is competitive with the rate of vibrational excitation by absorption of radiation from a pulsed CO/sub 2/ laser beam. Thermal lens signals consisting of rapid (microsecond time scale) oscillations of transmitted HeNe probe laser intensity are attributed to density fluctuations caused by expansion waves that propagate radially toward the center from the outside surface of the laser heated volume, where radially outward propagating shock waves also originate. Gas temperature is estimated from the time delay between the CO/sub 2/ laser pulse and the onset of oscillations. Vibrational temperatures are estimated from the ethylene to cyclopropane product ratio obtained in cyclobutanone photolysis.

• Research Organization: Univ. of Minnesota, Minneapolis
• OSTI ID: 5424394
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:18; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ARRHENIUS EQUATION
CARBON DIOXIDE LASERS
CHEMICAL REACTION KINETICS
CHEMISTRY
DATA
EQUATIONS
EXPERIMENTAL DATA
GAS LASERS
HELIUM-NEON LASERS
INFORMATION
KETONES
KINETICS
LASERS
MULTI-PHOTON PROCESSES
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMISTRY
PRESSURE DEPENDENCE
REACTION KINETICS