The total quenching rates of O2(bthinsp;1Sgr;+g) by CO2, H2O, and I2have been determined to be (4.53plusmn;0.29)times;10minus;13cm3thinsp;molecminus;1thinsp;secminus;1, (6.71plusmn;0.53)times;10minus;12cm3thinsp;molecminus;1thinsp;secminus;1, and (2.04plusmn;0.28)times;10minus;11cm3thinsp;molecminus;1thinsp;secminus;1, respectively. A pulsed, Ramanhyphen;shifted dye laser was used to excite a single rotational line of O2(1Sgr;,vprime;=0), while subsequent1Sgr;rarr;3Sgr; fluorescence was monitored by a photon counting technique to determine the deactivation rate as a function of the partial pressure of quenching gas. Rate constants for deactivation of O2(1Sgr;) by CO2and H2O were found to be consistent with those measured elsewhere, whereas I2was found to quench O2(1Sgr;) an order of magnitude more slowly than reported in the literature. The lower total quenching constant for I2suggests that the reaction O2(1Sgr;)+I2rarr;O2(3Sgr;) +2I might not be responsible for dissociation of I2in the chemical oxygenhyphen;iodine laser.
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