Abstract
Absolute frequency measurements, with up to level accuracies, are presented for 60 lines of the P and R branches for the band of at . The measurements were made using cavity-enhanced, diode-laser-based saturation spectroscopy. With one laser system stabilized to the line and a second laser system stabilized to the line whose frequency was to be determined, a frequency comb was employed to accurately measure the tetrahertz level frequency intervals. The results are compared with recent work from other groups and indicate that these lines would form a basis for a high-quality atlas of reference frequencies for this region of the spectrum.
© 2006 Optical Society of America
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