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\documentclass[11pt]{article}

\usepackage{hrms}  %% Page settings, style ... for the HRMS abstract book.

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\title{12CO2 TRANSITION FREQUENCIES WITH KHZ-ACCURACY BY SATURATION SPECTROSCOPY IN THE 1.99-2.09 MICRON REGION}

\author{\underline{\FirstName H. \LastName FLEURBAYE},
  \FirstName A. \LastName CAMPARGUE, 
  \FirstName S. \LastName KASSI,
  \FirstName D. \LastName ROMANINI,
  \underline{\FirstName D. \LastName MONDELAIN}}
\address{Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France}

\author{\underline{\FirstName P. \LastName \v{C}ERM\'AK}}
\address{Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynsk\'a Dolina, 842 48 Bratislava, Slovakia}

\author{\underline{\FirstName O. \LastName VOTAVA}}
\address{J. Heyrovsk\'y Institute of Physical Chemistry, ASCR, Dolejkova 3, Prague 8, Czech Republic}

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\usepackage{fancyhdr}
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
\fancyfoot[C]{}
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\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {3,9}
\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).

%% Index macro(s): see the abstract samples and the instructions
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%% Place the body of your abstract below.
Saturation spectroscopy has been used to determine absolute frequencies of 107 ro-vibrational transitions 
of the two strongest $^{12}$CO$_2$ bands of the 2 $\mu$m region. The considered 20012-00001 and 20013-00001 bands are 
of importance for the CO$_2$ monitoring in our atmosphere. Lamb dips were measured using a cavity ring-down 
spectrometer linked to an optical frequency comb referenced to a GPS-disciplined Rb oscillator or to an 
ultra-stable optical frequency. The comb-coherence transfer (CCT) technique was applied to obtain a RF 
tunable narrow-line laser comb-disciplined source using an external cavity diode laser and a simple electro-optic
modulator. This setup allows obtaining transition frequency measurements with kHz-level accuracy. 
The resulting accurate values of the energy levels of the 20012 and 20013 vibrational states are reproduced 
with a (1s)-rms of about 1 kHz using the standard polynomial model. The two upper vibrational states appear 
thus to be highly isolated except for a local perturbation of the 20012 state leading to an energy shift of 
15 kHz at J= 43. A recommended list of 145 transition frequencies with kHz accuracy is obtained providing 
secondary frequency standards across the 1.99-2.09 $\mu$m range. The reported frequencies will be valuable to 
constrain the zero-pressure frequencies of the considered transitions in $^{12}$CO$_2$ retrieval from atmospheric spectra.

\end{document}
