Abstract
The rate coefficient for the vibrational relaxation of isotopically-pure 13CO2 by ground state oxygen atoms was measured between 239 and 358K. O3 was photolyzed in a slow-flowing mixture of 13CO2, O3, and Xe to simultaneously create O atoms and stimulate a temperature-jump, shifting population into the first vibrationally-excited state of 13CO2. The population redistribution was monitored via transient diode laser absorption spectroscopy and the rate coefficient was extracted from the dependence of this redistribution on quencher concentration. The results are in good agreement with previous measurements of the 12CO2–O system, but with decreased uncertainty due to experimental improvements.
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