31 May 2022
31 May 2022
Status: this preprint is currently under review for the journal AMT.

Cavity ring-down spectroscopy of water vapor in the near-UV region

Qing-Ying Yang1, Eamon K. Conway2,3, Hui Liang1, Iouli E. Gordon2, Yan Tan1, and Shui-Ming Hu1 Qing-Ying Yang et al.
  • 1Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026 China
  • 2Center for Astrophysics, Harvard and Smithsonian, Atomic and Molecular Physics Division, Cambridge, MA, 02138 USA
  • 3Kostas Research Institute for Homeland Security, Burlington, MA, 01803 USA

Abstract. Water vapor absorption in the near-ultraviolet region is essential to describe the energy budget of Earth, but little spectroscopic information is available since it is a challenging spectral region for both experimental and theoretical studies. A continuous-wave cavity ring-down spectroscopic experiment was built to record absorption lines of water vapor around 415 nm. With a minimum detectable absorption coefficient of 4 × 10−10 cm−1, 40 rovibrational transitions of H162O were observed in this work, and 27 of them were assigned to the (224), (205), (710), (304), (093), (125), and (531) vibrational bands. A comparison of line positions and intensities determined in this work to the most recent HITRAN database is presented. Water vapor absorption cross-sections near 415 nm were calculated based on our measurements, which vary between 1 × 10−26 and 5 × 10−26 cm2/molecule. These data will also significantly impact the spectroscopy detection of trace gas species in the near-UV region.

Qing-Ying Yang et al.

Status: open (until 19 Jul 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2022-139', Anonymous Referee #1, 21 Jun 2022 reply

Qing-Ying Yang et al.

Qing-Ying Yang et al.


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Short summary
Water vapor absorption in the near-UV region is essential to describe the energy budget of Earth, however, there is little spectroscopic information available. And accurate near-UV water absorption is also required in both ground-based observations and satellite missions for trace gases species. Here, we provide the high-resolution spectra of water vapor around 415 nm measured with cavity ring-down spectroscopy. These absorption lines were never experimentally verified before.