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 Title: Frequency Comb Assisted, Cavity Ring-down, Lamb-dip Spectroscopy Of Acetylene At 1.39 μm. Author(s): Castrillo, Antonio Contributor(s): Gianfrani, Livio; Porzio, Giuseppe; Gravina, Stefania; Fasci, Eugenio Subject(s): Comparing theory and experiment Abstract: \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.2]{Figure_1.eps} \end{wrapfigure} Doppler-free saturated-absorption Lamb dips were observed for weak vibration-rotation transitions of acetylene between 7167 and 7217 \wn, using frequency comb assisted cavity ring-down spectroscopy. We measured the absolute center frequency of 16 lines of the 2\nub{3}+\nub{5}$^{1}$ band, targeting \textit{ortho} and \textit{para} states of the molecule. Line pairs of the P and Q branches were selected so as to form a V-scheme, sharing the lower energy level. Such a choice made it possible to determine the rotational energy separations of the excited vibrational state for J-values from 11 to 20. The spectrometer is an upgraded version of that described by Fasci \textit{et al.}\footnote{E. Fasci \textit{et al.}, Phys. Rev. A \textbf{98}, 022516, (2018).}, the main novelty being the use of a BOA - Booster Optical Amplifier, to increase the optical power injected into the high-finesse cavity. Our data provide a very stringent test of the MARVEL analysis recently performed on acetylene\footnote{K.L. Chubb \textit{et al.} J. Quant. Spectrosc. Radiat. Transfer \textbf{204}, 42–55, (2018).}. Figure on the right reports an example of observed Lamb dips recorded in correspondence of the line doblet already exploited for low-uncertainty Doppler-broadening gas thermometry\footnote{A. Castrillo \textit{et al.} Phys. Rev. Appl. \textbf{11}, 064060, (2019)}. Issue Date: 2021-06-22 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111569 Date Available in IDEALS: 2021-09-24
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