Flash photolysis resonance fluorescence investigation of the reaction of O(3P) atoms with ClONO2

✍ Scribed by Michael J. Kurylo

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 398 KB
• Volume: 49
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)87016-4

✦ Synopsis

The flash photolysis resonance fluorescencc technique has been used to measure the rrtte constant for the rcaction of O(3P) atoms with CION at 10 torr total pressure over the temperature range 225-273 K. The values obtained can be fit to the Arrhenius equation kr = (1.87 f 1.29) X 10-12 exp[ -(692 i 167)/T] rm3 molecule-' s-' . A composite Arrhenius expression is calculated from the combined results of the present study and a recent investigation by Molina et al. Because of the expanded data base this equation is considered more reliable and is recommendcd over tbc termperature range 313-295 K: kr = (3.03 f 1.56) X 10-12 exp[-(808 + 133]/T] cm3 molecule-' s-r. The uncertainties expressed are the standard devïarions taken from a least squares analysis of the data and take into account the 95% confidence limits (+2u) of the individual points. Comparison of the toss rate for CIONOI by oxygen atom reaction with the solar photolysis ratc indicates that chemical reaction accounts for less than 15% of the ClON02 removal at stratosphcric altitudes beween 20 and 30 km.