Excimer Laser (ArF, 193 nm) Photodissociation of Carbon Monoxide

摘要

The photolysis of carbon monoxide (CO) with the ArF excimer laser (193 nm) hasbeen investigated using a pump and probe laser experiment. Ground state oxygen atomic fragments which are produced in the ArF laser photolysis of CO are detected by monitoring the 844.7 nm laser induced fluorescence following the two photon excitation of the oxygen transitions near 225.6 nm. The slope (n) of a Ln-Ln plot of the fluorescence signal intensity vs. laser photolysis of CO is determined. A mechanism is proposed where the initial absorption of one ArF photon produces CO a cubed II, v'=2) which subsequently absorbs one additional ArF laser photon into a dissociative state with suspected triplet character.