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Frequencies for 32 P-branch transitions of the O 2 A-band (b1Σg+←X3Σu-) were measured between 12975 and 13115cm −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 39 K D 1 and D 2 atomic transitions...
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