The temperature dependence of the exchange reaction between oxygen atoms and dioxygen molecules studied by means of isotopes and spectroscopy

✍ Scribed by M. Regin Wiegell; N. Wessel Larsen; T. Pedersen; H. Egsgaard

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 183 KB
• Volume: 29
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1997)29:10<745::aid-kin3>3.0.co;2-m

✦ Synopsis

The temperature dependence of the rate constant for the exchange reaction between oxygen atoms and dioxygen molecules has been studied using the oxygen isotopes and . The reaction was studied by VIS-photolysis of ozone in the presence of isotopic 16 18

O O dioxygen and with nitrogen as a bath gas at five different temperatures, 143 K, 173 K, 203 K, 253 K, and 295 K. High-resolution microwave spectroscopy was used to measure the composition of the ozone isotopomer mixtures and mass-spectrometry was used to determine the abundances of the isotopomeric dioxygen species formed during the reaction. The rate constant was determined to be (T/300 cm 3 s Ϫ1 (Ϯ2)

or as the ratio between rate constants for exchange and for ozone formation, (4.67 Ϯ 1.3) ϫ (T/300