Optical frequency comb Fourier transform spectroscopy of formaldehyde in the 1250 to 1390 cm${}^{-1}$ range: experimental line list and improved MARVEL analysis

Abstract

We use optical frequency comb Fourier transform spectroscopy to record high-resolution, low-pressure, room-temperature spectra of formaldehyde (H${}_2$${}^{12}$C${}^{16}$O) in the range of 1250 to 1390 cm${}^{-1}$. Through line-by-line fitting, we retrieve line positions and intensities of 747 rovibrational transitions: 558 from the ${\nu }_6$ band, 129 from the ${\nu }_4$ band, and 14 from the ${\nu }_3$ band, as well as 46 from four different hot bands. We incorporate the accurate and precise line positions (0.4 MHz median uncertainty) into the MARVEL (measured active vibration-rotation energy levels) analysis of the H${}_2$CO spectrum. This increases the number of MARVEL-predicted energy levels by 82 and of rovibrational transitions by 5382, and substantially reduces uncertainties of MARVEL-derived H${}_2$CO energy levels over a large range: from pure rotational levels below 200 cm${}^{-1}$ up to multiply excited vibrational levels at 6000 cm${}^{-1}$. This work is an important step toward filling the gaps in formaldehyde data in the HITRAN database.

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Cited by in corpus (3)

• Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications
• ExoMolHR: A Relational Database of Empirical High-Resolution Molecular Spectra
• Broadband near-ultraviolet dual comb spectroscopy