The low-temperature quenching of singlet molecular oxygen [O2(a 1? g )]
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 82 (6) , 963-970
- https://doi.org/10.1039/f29868200963
Abstract
An apparatus has been constructed to study the quenching and emission reactions of O2(a1Δg) at temperatures between 100 and 450 K and measurements have been made of the quenching of O2(a1Δg) by oxygen itself in this range. The rate constant was found to be k/dm3 mol–1 s–1=(1896 ± 65) exp [–(205 ± 8)/T]. The results agree well with those recently obtained at high pressures with laser excitation of O2(a1Δg) and also, within the range, fit with the predictions of a theory in which the electronic energy is distributed as vibrational energy between the two quenchers. However, the detailed temperature dependence is not predicted correctly and this is attributed to the neglect of the possible temperature dependence of the curve-crossing between O2(a1Δg) and O2(X3Σ– g). A comparison is made between the observed temperature dependences of the quenching reactions of O2(a1Δg) and O2(b1Σ+ g).Keywords
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