Looking for position and intensity patterns in the 2OH-stretch band of buffer gas cooled methanol.

Libert, Alexis;Roucou, Anthony;Hays, Brian;Glorieux, Robin;Lauzin, Clément;et.al.
(2024) 17th Biennial HITRAN Conference united with 16th ASA conference (2024) — Location: Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts (24.June.2024)

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Abstract
Methanol is a six-atoms asymmetric top molecule presenting internal rotation, and which has a dense and complicated spectral signature. Complexity further increases in the overtone range. Due to these features, this molecule remains poorly known, especially in the near infrared. To simplify its molecular signature, spectroscopy can be performed at cryogenic temperature so that only the states lying low in energy are populated, leading to an important simplification of the measured spectra along with a narrowing of the Doppler-broadened lines. In this talk, I will introduce the experimental development of a buffer gas cooling (BGC) setup combined with a cavity ring-down spectrometer with a detection limit αmin = 2 × 10−10cm−1 and spectral resolution of few 10−4 cm−1. With this instrument, we measured the 2OH stretching band of methanol between 7165 cm−1 and 7230 cm−1 cooled down to 26 ± 12 K in a buffer gas cooling experiment. A total of 350 rovibrational transitions were assigned and 62 rovibrational transitions were tentatively assigned. This assignment was performed by using and extending the pattern recognition method developed by Rakvosk´y et al.1. I will explain how we used the relative intensities of the transitions to add one criterion to test the validity of our assignments. Improvements and future outcomes of this approach and of the BGC setup will be discussed.
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Libert, A., Glorieux, R., & Lauzin, C. (2024). Looking for position and intensity patterns in the 2OH-stretch band of buffer gas cooled methanol. 17th Biennial HITRAN Conference united with 16th ASA conference (2024), Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts. https://hdl.handle.net/2078.5/248241