Abstract

Infrared laser pulses of different temporal pulse shape with a length of 2–50 ns and a nominal power of 100–1000 MW are generated by a TEA CO 2 laser oscillator combination using saturable intracavity absorbers and a fast CdTe electro-optical switch. The multiphoton dissociation of CF 3I + nhv → CF 3 + I at 1074.6 cm −1 and p(CF 3I) = 10 Pa was studied using these pulses. The product yields and the absolute rate constants were determined for different temporal pulse profiles, showing clear intensity effects at low intensities and a transition to a linear intensity regime at higher intensities.

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