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 Title: Dual Frequency Comb Absorption Spectroscopy Of Co2 At High Pressure And Temperature Author(s): Cole, Ryan K. Contributor(s): Rieker, Gregory B; Hoghooghi, Nazanin Subject(s): Lineshapes, collisional effects Abstract: Accurate absorption models for gases at high pressure and temperature are needed for applications in both planetary and combustion science. Absorption models for these conditions require complete databases of temperature-dependent line shape parameters as well as temperature-dependent models for higher-order collisional effects that manifest at high pressure (e.g. line mixing, collision-induced absorption, finite duration collisions). In support of this goal, we present new measurements of CO$_{2}$ at pressures up to 25 bar and temperatures up to 981 K recorded with a broadband, high-resolution dual frequency comb absorption spectrometer in a specialized gas cell. We analyze the measured spectra using a multispectrum fitting approach to extract temperature-dependent line shape parameters for bands in the 6800 – 7000 cm$^{-1}$ range using both a Voigt and speed-dependent Voigt profile. We compare the new parameters to prior measurements and calculations, particularly those adopted for the HITRAN2020 database. Finally, using the new line shape parameters, we expand our absorption model to include line mixing effects, and discuss the performance of the line mixing model at high pressure and temperature. These results improve absorption models for CO$_{2}$ in high-pressure and -temperature conditions and, more broadly, inform strategies for modelling high-pressure, high-temperature spectra in combustion and planetary science. Issue Date: 2021-06-22 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111196 Date Available in IDEALS: 2021-09-24
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