Abstract

Suppression of photolysis wavelengths below 220 nm influences markedly the performance of the CH 3I laser, the temporal behaviour of the laser pulse, the decomposition products and the gain are fundamentally altered. The effect of shorter wavelength is ascribed to the formation of relatively high yields of vibrationally excited methyl radicals. Several pieces of information are reported that confirm this assumption. It is shown that under the appropriate conditions repetitive operation on the same substrate of CH 3I is possible. Chemical pumping participation is ruled out.

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