Electronic-to-vibrational energy-transfer studies of singlet molecular oxygen. 1. O2(a1Δg)

J. P. Singh, J. Bachar, D. W. Setser, S. Rosenwaks

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A gas flow reactor was used to measure the total quenching rate constants of O2(a1Δg) with 26 small molecules at room temperature. With the exception of CF3NO, which probably quenches by an excitation-transfer mechanism, the electronic-to-vibrational (E-V) energy-transfer rate constants are rather small and fall in the 10-16-10-18 cm3 molecule-1 s-1 range. Attempts were made to observe the infrared emission from products of the E-V transfer, but conclusive assignment was only possible for the quenching of O2(a1Δg) by HF. Both HF(v=2) and HF(v=1) seem to be primary products from the HF + O2(a) reaction.

Original languageEnglish
Pages (from-to)5347-5353
Number of pages7
JournalJournal of Physical Chemistry
Issue number25
StatePublished - 1 Jan 1985


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