Abstract
Frequencies for 32 P-branch transitions of the O 2 A-band ( b 1 Σ g + ← X 3 Σ u - ) were measured between 12 975 and 13 115 cm −1 using the frequency-stabilized cavity ring-down spectrometer located at National Institute of Standards and Technology, Gaithersburg, MD. Absolute line positions were calibrated using the hyperfine components of 39K D 1 and D 2 atomic transitions yielding uncertainties <1 MHz (∼3 × 10 −5 cm −1). Spectroscopic parameters for the b 1 Σ g + ( v = 0 ) state were calculated and compared with previously determined values. These new transition frequencies should serve as a convenient secondary calibration standard in the 760 nm region.
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