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2 Author(s)
VanZee, Richard J. ; Department of Chemistry, University of Florida, Gainesville, Florida 32611 ; Khan, Ahsan U.

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A recent report of ultraviolet light amplification by the cool green phosphorus chemiluminescence flame in the 200–400 nm region, interpreted as an optical gain phenomenon via stimulated emission, has been critized by Benard. Claiming that the rate of chemical reaction is several orders of magnitude too small to support the observed amplification, he has interpreted our result as a focusing phenomenon. In this communication, we point out that an improper spectral parameter was used to evaluate the rate of chemical reaction, and that his claim that focusing is responsible for our observation is inconsistent with our experiments. Nonrecognition of the broadened multilevel inversion in the ambient atmospheric flame is the probable source of his erroneous conclusion.

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Journal of Applied Physics  (Volume:53 ,  Issue: 10 )