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Title:Doppler Broadening Thermometry Based On Cavity Ring-down Spectroscopy
Author(s):Hu, Shui-Ming
Contributor(s):Zhang, Jin-Tao; Liu, An-Wen; Sun, Yu Robert; Tan, Yan; Wang, Jin; Cheng, Cunfeng
Subject(s):Instrument/Technique Demonstration
Abstract:A Doppler broadening thermometry is implemented using a laser-locked cavity ring-down spectrometer%~[1,2] \footnote{ H. Pan, C.-F. Cheng, Y.~R. Sun, B. Gao, A.-W. Liu, S.-M. Hu, ``Laser-locked, continuously tunable high resolution cavity ring-down spectrometer,'' Rev. Sci. Instrum. \textbf{82}, 103110 (2011)} \footnote{ Y.~R. Sun, H. Pan, C.-F. Cheng, A.-W. Liu, J.-T. Zhang, S.-M. Hu, ``Application of cavity ring-down spectroscopy to the Boltzmann constant determination,'' Opt. Express, \textbf{19}, 19993 (2011) } combined with a temperature-stabilized sample cell. The temperature fluctuation of the gas sample cell is kept below 1 mK for hours. The probing laser is frequency locked at a longitudinal mode of a Fabry-P\'{e}rot interferometer made of ultra-low-expansion glass, and the spectral scan is implemented by scanning the sideband produced by an electro-optic modulator. As a result, a kHz precision has been maintained during the measurement of the spectrum of 10 GHz wide. A ro-vibrational line of C$_2$H$_2$ is measured at sample pressures of a few Pa. Using a pair of mirrors with a reflectivity of 0.99997 at 787 nm, we are able to detect absorption line profiles with a signal-to-noise ratio of $10^5$. Fitting of the recorded spectra allows us to determine the Doppler width with a statistical uncertainty of 10 ppm. Further improvements on the experimental reproducibility and investigations on the collision effects will probably lead to an optical determination of the Boltzmann constant with an uncertainty of a few ppm. %\begin{thebibliography}{2}% %\bibitem {Pan2011RSI_LL_CRDS}% % H. Pan, C.-F. Cheng, Y.~R. Sun, B. Gao, A.-W. Liu, S.-M. Hu, % ``Laser-locked, continuously tunable high resolution cavity ring-down spectrometer,'' % Rev. Sci. Instrum. \textbf{82}, 103110 (2011) % %\bibitem {Sun2011OE}% % Y.~R. Sun, H. Pan, C.-F. Cheng, A.-W. Liu, J.-T. Zhang, S.-M. Hu, % ``Application of cavity ring-down spectroscopy to the Boltzmann constant determination,'' % Opt. Express, \textbf{19}, 19993 (2011) % %\end{thebibliography}%
Issue Date:2014-06-17
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Hu, S.; Zhang, J.; Liu, A.; Sun, Y.R.; Tan, Y.; Wang, J.; Cheng, C. DOPPLER BROADENING THERMOMETRY BASED ON CAVITY RING-DOWN SPECTROSCOPY. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TJ12
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/51149
DOI:10.15278/isms.2014.TJ12
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:2014-09-17
2015-04-14


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