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The rate coefficient for the vibrational relaxation of isotopically-pure 13 CO 2 by ground state oxygen atoms was measured between 239 and 358 K. O 3 was photolyzed in a slow-flowing mixture of 13 CO 2 , O 3 , and Xe to simultaneously create O atoms and stimulate a temperature-jump, shifting population into the first vibrationally-excited state of 13 CO 2 . 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 12 CO 2 –O system, but with decreased uncertainty due to experimental improvements. |
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