Abstract
Cavity ring-down spectroscopy (CRDS) has been applied to the detection of oxygen atoms, on the highly forbidden 1D 2 ← 3P 2 line at 630.030 nm. Results are presented for CRDS detection in a discharge flow system, in which the atoms are prepared by a microwave discharge of N 2O/Ar or O 2. Comparison of concentrations determined by CRDS and chemical titration by NO 2 is made. CRDS is found to be a non-intrusive technique for the determination of oxygen atom concentrations in the range of 10 14 atoms cm −3 and higher, with an estimated accuracy of ⩽20%.
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