Abstract
We have investigated multiphoton fragmentation processes in CO2 as a function of pressure (10−4−100 Torr) and excitation wavelength. Subsequent to excitation by a line-narrowed (~3-cm−1) tunable (~150-cm−1) ArF* excimer laser (λ ~ 193 nm), we monitored the dispersed fluorescence along with the ion signal produced by the photofragments. Although CO2 has no strong intermediate resonances at 193 nm, our preliminary results show a strong three-photon photolysis channel leading to atomic carbon which suggests a complete breakup of the molecule. At the same time, CO2 sustains laser-induced breakdown at relatively low pressures (~7 Torr), which indicates a strong multiphoton (at least three) ionization channel as well.
© 1987 Optical Society of America
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