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Rate constants for the quenching of metastable O2(1Σ) molecules

✍ Scribed by Kwang Yul Choo; Ming-Taun Leu

Publisher: John Wiley and Sons
Year: 1985
Tongue: English
Weight: 412 KB
Volume: 17
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550171102

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✦ Synopsis

Singlet molecular oxygen, 02('Z,i), is one of the irqportant intermediate species in the atmospheres of Earth, Mars, and Venus. To elucidate the chemistry of this excited molecular oxygen, a series of kinetic measurements have been undertaken using the flow-dischargeioptical-emission technique. By monitoring the characteristic emission (762 nm for 'Xi), the quenching rates for several important molecules have been obtained a t room temperature. The following table summarizes measurements.

The error limits represent one standard deviation. The systematic error is estimated to be about 15%. For C02 and O3 molecules, the quenching rate constants were also measured in the temperature range of 245-362 K. In both reactions, negligible temperature dependences (with the activation energy less than 0.6 kcal/mole) were observed.

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