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\title{CONTINUUM MEASUREMENTS IN GASES OF NONPOLAR MOLECULES AND THEIR MIXTURES IN THE MILLIMETER WAVE RANGE}

\author{\FirstName T. \LastName GALANINA,
  \underline{\FirstName A. \LastName KOROLEVA},
  \FirstName I. \LastName AMERKHANOV,
  \FirstName E. \LastName SEROV,
  \FirstName M. \LastName KOSHELEV and
  \FirstName M. \LastName TRETYAKOV}
\address{A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences, 46 Ulyanov Str. 603950, 
Nizhny Novgorod, Russia}


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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\index{SF$_5$Cl}
\index{Ab initio}

This work presents CO$_2$-CO$_2$, CO$_2$-Ar, CH$_4$-CH$_4$, CH$_4$-CO$_2$, CH$_4$-N$_2$, CO$_2$-N$_2$, and N$_2$-Ar continuum measurements at pressures up to 2 atmospheres at room temperature in a frequency range of 155-255 GHz with expected extension down to about 80 GHz and up to 350 GHz. 
It continues the cycle of our recent studies of atmospheric nonpolar molecules spectra, 
which began with N$_2$ \footnote{
\href{https://doi.org/10.1016/j.jqsrt.2019.106774}{doi:10.1016/j.jqsrt.2019.106774},
E. A. Serov, \textit{et al.}, \textit{J. Quant. Spectrosc. Radiat. Transfer},
\textbf{242}, 106774, (2020).} and CO$_2$ \footnote{
\href{https://doi.org/10.1016/j.jqsrt.2020.107400}{doi:10.1016/j.jqsrt.2020.107400},
T. A. Odintsova, \textit{et al.}, \textit{J. Quant. Spectrosc. Radiat. Transfer},
\textbf{258}, 107400, (2021).} continuum measurements using a resonator spectrometer \footnote{
\href{https://doi.org/10.1109/TTHZ.2018.2875450}{doi:10.1109/TTHZ.2018.2875450},
M.A. Koshelev, \textit{et al.}, \textit{IEEE Transactions on Terahertz Science and Technology},
\textbf{8(6)}, 773, (2018).}. The obtained data are valuable for studying the atmospheres of Solar system planets, exoplanets and their satellites, 
where the continuum absorption can make a considerable contribution to the total absorption and planetary radiation balance.\\
In considered frequency range, the absorption of all the studied gases is determined by bimolecular absorption under chosen conditions. 
The only exception is methane with a rotationally induced resonance spectrum of CH$_4$ monomer that contributes up to 40\% to the total observed absorption. 
The expected bimolecular pressure dependences are experimentally verified and confirmed for all mixtures under consideration. 
Quadratic frequency dependence of the continuum is observed, except for CO$_2$-Ar, CH$_4$-CO$_2$ and CO$_2$-N$_2$ mixtures. 
This deviation from the quadratic law, which is stipulated in our spectral range by the so-called radiation term, may indicate a significant contribution of dimers to the continuum.\\
The obtained spectra are expected to be used for validating results of ongoing bimolecular absorption calculations using a semiclassical trajectory-based method \footnote{
\href{https://doi.org/10.1063/1.5125756}{doi:10.1063/1.5125756},
D.N. Chistikov, \textit{et al.}, \textit{J. Chem. Phys.},
\textbf{151}, 194106, (2019).}$^,$ \footnote{\href{https://doi.org/10.3847/1538-4365/ac36d3}{doi:10.3847/1538-4365/ac36d3},
A.A. Finenko, \textit{et al.}, \textit{The Astrophysical Journal Supplement Series},
\textbf{258}, 33, (2022).}
which looks promising for detailed understanding of the continuum absorption nature on a much broader scale in terms of frequency, temperature and type of colliding molecules.\\ 
The study was supported by the Russian Science Foundation (\href{https://rscf.ru/project/22-17-00041/}{project 22-17-00041})


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