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 Title: Mid-ir Sub-doppler Eresolution Spectrometer Using An Enhanced-cavity Absorption Cell Coupled With A Wide Beam Author(s): Abe, Masashi Contributor(s): Sasada, Hiroyuki; Okubo, Sho; Iwakuni, Kana Subject(s): Instrument/Technique Demonstration Abstract: We have introduced a wide-beam-coupled enhanced-cavity absorption cell (ECAC) into a 3-$\mu$m difference-frequency generation spectrometer in order to reduce transit-time broadening of Lamb dips. It contains concave and convex mirrors with a curvature radius of $\pm$7 m separated by 37.5 cm, has a finesse of 770, and is coupled with a Gaussian beam having a $1/\text{e}^2$ radius of 1.9 mm at beam waist. The spectrometer is applied to record sub-Doppler resolution spectra of the $\nu _3$ band of CH$_4$ and the $\nu _1$ and $\nu _4$ bands of CH$_3$D, and the transit-time broadening is estimated 30 kHz for these molecules. The observed Lamb dips are about 80 kHz (HWHM) wide, which is one third of those recorded using another ECAC coupled with a $1/\text{e}^2$ radius of 0.7 mm at the beam waist. Some $A_1$-$A_2$ splittings of the low $J$ levels for CH$_3$D are first resolved, and the absolute transition frequencies are determined with a relative uncertainty of 10$^{-9}$. Issue Date: 2014-06-17 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Abe, M.; Sasada, H.; Okubo, S.; Iwakuni, K. MID-IR SUB-DOPPLER ERESOLUTION SPECTROMETER USING AN ENHANCED-CAVITY ABSORPTION CELL COUPLED WITH A WIDE BEAM. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TJ13 Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/50795 DOI: 10.15278/isms.2014.TJ13 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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