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\documentclass[11pt]{article}

\usepackage{hrms}

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\title{TEMPERATURE DEPENDENCE OF THE ABSORPTION OF THE R(6) MANIFOLD OF THE 2NU3 BAND OF METHANE IN AIR IN SUPPORT OF THE MERLIN MISSION}

\author{\FirstName S. \LastName VASILCHENKO,
  \FirstName S. \LastName KASSI,
  \FirstName A. \LastName CAMPARGUE,
  \underline{\FirstName D. \LastName MONDELAIN}}
\address{Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France}
\author{\underline{\FirstName T. \LastName DELAHAYE}, 
\FirstName R. \LastName ARMANTE,
\FirstName H. \LastName TRAN}
\address{Laboratoire de M\'et\'eorologie Dynamique, IPSL, CNRS, Ecole polytechnique, Universit\'e Paris-Saclay, Palaiseau, France}

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\usepackage{fancyhdr}
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\category {3,9}
\begin{document}

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%% Place the body of your abstract below.
Fifty nine high sensitivity spectra of the R(6) manifold of the 2$\nu$$_3$ band of methane in air, near 1.64 $\mu$m, 
have been recorded in support of the MERLIN mission. For this purpose, a cavity ring down spectrometer (CRDS) 
with a spectrally narrowed and stable (sub-kHz) laser source was coupled to a temperature regulated high-finesse 
optical cavity. The frequency scale of each spectrum was accurately determined from measurements of the beat note 
between a part of the laser light and the closest tooth of a frequency comb referenced to a rubidium clock. Series 
of spectra were recorded between 243 and 313 K with a 10 K temperature step. For each series, total pressure values 
of 50, 100, 250, 500 and 750 Torr were adopted. A multi-spectrum fitting procedure with the Hartmann-Tran (HT) line 
profile, including the first-order line-mixing parameter, has been used to derive the spectroscopic parameters for 
each of the six R(6) components, along with the temperature dependence of the line-shape parameters. The results 
show that the fitted model is able to reproduce the experimental spectra with a relative precision better than 0.2\% 
for the entire R(6) manifold spectral region and better than 0.05\% at the ON-line position of the MERLIN mission for 
the 250, 500 and 750 Torr spectra. The relative precision increases to 0.3\% and the residuals at the ON-line position 
to 0.1\% when including the 50 and 100 Torr spectra. Comparisons with ground-based atmospheric measurements show that 
these data significantly improve the modeling of methane absorption in this spectral region. We propose here a new 
complete line list of the methane spectrum in the region of the R(6) manifold allowing reducing notably the residuals 
at the ON-line position of the MERLIN mission.


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