Abstract
A highly sensitive cavity-enhanced frequency modulation spectroscopy technique has been used to measure ultraweak transitions in molecular oxygen that had not previously been characterized. The self-broadened half-width and line intensity of the measured transitions are reported. We include 12 high J transitions in the b 1 Σ g + ( v ′ = 0 ) ← X 3 Σ g - ( v ″ = 0 ) band of 16O 2 (the so-called A band), 59 transitions in the b 1 Σ g + ( v ′ = 1 ) ← X 3 Σ g - ( v ″ = 1 ) hot band of 16O 2, and 17 high J transitions in the b 1 Σ g + ( v ′ = 0 ) ← X 3 Σ g - ( v ″ = 0 ) band of 16O 18O. Our measurements of line positions of the 16O 18O transitions are used to determine improved molecular constants for the b 1 Σ g + ( v ′ = 0 ) excited state of 16O 18O.
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