High-temperature methane absorption with a dual frequency comb spectrometer
Malarich, Nathan A.
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https://hdl.handle.net/2142/104483
Description
Title
High-temperature methane absorption with a dual frequency comb spectrometer
Author(s)
Malarich, Nathan A.
Contributor(s)
Rieker, Gregory B.
Drouin, Brian
Sung, Keeyoon
Coburn, Sean
Yun, David
Issue Date
2019-06-18
Keyword(s)
Small molecules
Abstract
Quantitative measurements of combustion system fueling and hot-Jupiter exoplanets require accurate methane absorption data at elevated temperatures. The ExoMol and HITRAN spectral databases in the near-infrared 6500-9000cm-1 range are based on the 10to10 potential energy surface, and the 80K and 296K empirical WKLMC linelist, respectively, which do not empirically constrain all elevated-temperature behavior. We present spectra of the near-infrared methane overtone band around 1400nm at temperatures from 296 K to 900 K. The spectra are taken using a three-zone tube furnace and a dual-frequency comb spectrometer with 600 cm-1 bandwidth and .00667cm-1 resolution. These measurements are targeted toward providing a compact, accurate methane absorption linelist for 300-900K.
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