Abstract
Optoacoustic measurements of NO<sub>2</sub> excited by an Ar<sup>+</sup> laser were performed in the presence of NO, N<sub>2</sub>, H<sub>2</sub>O, and O<sub>2</sub> matrix gases. Identical sensitivities were measured in all matrix gases except O<sub>2</sub> where energy transfer from NO<sub>2</sub> to the metastable O<sub>2</sub>(<sup>1</sup>Δ<sub>g</sub>) state resulted in a dramatic decrease in sensitivity.
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