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\documentclass[11pt]{article}

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

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\title{NEW SUPERSONIC JET NEAR IR SPECTRA OF AMMONIA AND CHLOROMETHANE}

%% Note that \author and \address macros must be paired.
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\author{\underline{\FirstName O. \LastName VOTAVA},
  \FirstName K. \LastName BURIAN, and
  \FirstName J. \LastName RAKOVSK\'Y}
\address{J. Heyrovsk\'y Institute of Physical Chemistry of the CAS, Dolej\v skova 2155/3, Prague 8, 182 23, Czech Republic}

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%\author{\underline{\FirstName G. \LastName HHHHH-IIIIIII Jr},
%  \FirstName J. \LastName KKKKKKKKKK,
%  \underline{\FirstName L. \LastName MM NN PPPPPP}}
%\address{Address of the institution for the second author(s)}

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\usepackage{fancyhdr}
\pagestyle{fancy}
\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 {5,3}
\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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\index{Chloromethane}
\index{ammonia}
\index{overtone spectra}
\index{supersonic jet}

%% Place the body of your abstract below.

We report new high resolution near IR spectra of chloromethane (CH$_3$Cl) and ammonia (NH$_3$): Specifically for chloromethane $ 2\nu_4^0 $  (6007 $cm^{-1}$ - 6033 $cm^{-1}$) and $ 2\nu_1 $  (5850 $cm^{-1}$ - 5910 $cm^{-1}$) vibratioal bands have been recorded and two combination bands of ammonia were recorded in ranges 5990 $cm^{-1}$ - 6090 $cm^{-1}$  and 7590 $cm^{-1}$ - 7710 $cm^{-1}$ All data were obtained with tunable diode laser spectrometer coupled to pulsed, slit nozzle (0.1mm x 40mm) supersonic jet. Observed absorption spectra exhibit low rotational and Doppler temperature down to 20 K and as a result are significantly less congested compared to room temperature data.  Spectral line positions have been determined with accuracy of 3x10$^{-4}$cm$^{-1}$ by referencing to methane transitions in the same spectral regions.  

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Ammonia spectra are compared with existing FTIR data for assignment verifications and also with ExoMol CoYuTe linelist \footnote{P.A. Coles \textit{et al.,  Monthly Notices of the Royal Astronomical Society}\underline{\textbf{490}}, 4638 (2019).}. Agreement with the CoYuTe prediction is rather exeptional, with standart devidation between measured and predicted line position  0.056  $cm^{-1}$ in the 7600  $cm^{-1}$ band. The chloromethane spectra are partially assigned using effective Hamiltonnian approach and verified with GSCD. The data are also compared with  theoretical  Exomol linelists \footnote{A. Owens \textit{et al.,  Monthly Notices of the Royal Astronomical Society} \underline{\textbf{479}}, 3002 (2018).}. The overall agreement between the theory and experiment is lower than in the case of ammonia:  The band origin  for the CH$_3 \, ^{35}$Cl  $ \nu_1 + \nu_4 $ vibration is about 1.64 cm$^{-1}$ higher than the experimental value. 



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