Time-Resolved Diode Laser Absorption Spectroscopy of CF2 Produced in UVPhotodissociation of C2F4 and Measurement of Upsilon3 Absorption Band Strength

摘要

Difluorocarbene (CF2) has been observed by time-resolved diode laser absorptionspectroscopy following excimer-laser photolysis of C2F4. A band strength of 2.8 X 10-17 cm molecule-1 for the v3 band may be inferred from the absorption measurements, assuming a quantum yield CF2 = 2 from C2F4 photodissociation. This agrees, well with other experimental estimates, but is somewhat lower than theoretical predictions. Keywords: Photodissociation, Difluorocarbene, Transient spectroscopy. (JES)