Abstract

The technique of saturation spectroscopy is applied to measure the concentration of C₂ in the ³Π_u state in oxyacetylene flames. The two level model is further developed and extended for use in intensity regions slightly lower than that required to saturate the resonances completely. As a result, it has proved feasible to measure both the C₂ number density in the ³Π_u state of ~10¹⁶/cm³ and an excited electronic state lifetime of ~10⁻¹² sec, both of which depend only on the Einstein A coefficient. The experimental setup is described in detail, and possible extensions of the technique to other atomic and molecular systems are discussed.

© 1977 Optical Society of America

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