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\title{POPULATING THE EXOMOL DATABASE WITH LINESHAPE PARAMETERS: COLLISIONAL BROADENING AND SHIFTING OF ACETYLENE}

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\author{\underline{\FirstName A. \LastName SOKOLOV},
        \FirstName S.N. \LastName YURCHENKO,
        \FirstName J. \LastName TENNYSON}
\address{Department of Physics and Astronomy, University College London, London WC1E 6BT, UK}

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\author{\FirstName R.R. \LastName GAMACHE}
\address{Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts Lowell, Lowell, MA 01854, USA}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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Collisional lineshape parameters are one of the indispensable data inputs necessary to produce absorption/emission cross-sections which are required in radiative transfer calculations and spectral retrievals.
To be exhaustive, these parameters need to be calculated for a number of  ``radiating molecule -- collisional perturber'' pairs and at different temperatures.
Of particular interest to a burgeoning field of exoplanetary science are the parameters at temperatures higher than those usually required
for terrestrial studies, typically around 500--3000~K.

We discuss our recent progress in using a semiclassical method called  Modified Complex Robert-Bonamy (MCRB) approach in calculating broadening
and shifting coefficients of acetylene (C$_2$H$_2$) for several perturbers  (H$_2$, He, N$_2$ and C$_2$H$_2$) for a large range of temperatures. This report is a part of the ongoing work to populate the ExoMol database with lineshape parameters, including the line list for acetylene aCeTy containing over 3 billion transitions,  with little or no line broadening information. Comparisons with a large pool of existing theoretical and experimental acetylene data are shown. In addition, discussed are the difficulties arising when modelling vibrational dependence of lineshape parameters.




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