Quantitative laser measurement of very small absorptions: Studies of the O + CS→CO(V) + S reaction

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Abstract
An intracavity laser technique has been developed to detect quantitatively very small absorptions by measurements of the laser oscillation range. The technique has been applied to the measurement of the absolute densities of the individual vibrational levels of CO produced from the reaction between O and CS in a fast flow reactor prior to any significant relaxation. Optical losses (or gains) as small as 0.01% were detectable with the present apparatus. The detectivity may be further improved by an order of magnitude with lower loss optics and a more stable laser.
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