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Frequency metrology of the acetylene lines near 789 nm from lamb-dip measurements
Journal of Quantitative Spectroscopy and Radiative Transfer 210:111-115 May 2018

Tao, Lei-Gang; Hua, Tian-Peng; Sun, Yu R.; Wang, Jin; Liu, An-Wen; Hu, Shui-Ming

Lamb-dips of the ro-vibrational lines of 12C2H2 near 789 nm were recorded using cavity ring-down saturation spectroscopy. Calibrated by an optical frequency comb, frequencies of 45 acetylene lines were determined with an accuracy of  cm (), which is over two orders of magnitude more accurate than previous Doppler-limited studies. An averaged shift of about 0.01 cm were found by comparing the upper energies obtained in this work to those recently presented by Chubb et al. from a MARVEL analysis.

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