The 5.8 µm absorption bands for nitric acid (H$^{14}$N$^{16}$O$^3$ ): line positions and intensities for the ν$_2$ band at 1709.567 cm$^{−1}$ and for its first associated hot bands (ν$_2$+ν$_9$-ν$_9$, ν$_2$+ν$_7$−ν$_7$ , ν$_2$ +ν$_6$ −ν$_6$ ) - Laboratoire de Météorologie Dynamique (LMD) Accéder directement au contenu
Article Dans Une Revue Molecular Physics Année : 2022

The 5.8 µm absorption bands for nitric acid (H$^{14}$N$^{16}$O$^3$ ): line positions and intensities for the ν$_2$ band at 1709.567 cm$^{−1}$ and for its first associated hot bands (ν$_2$+ν$_9$-ν$_9$, ν$_2$+ν$_7$−ν$_7$ , ν$_2$ +ν$_6$ −ν$_6$ )

Résumé

This paper is the second of two back-to-back works, whose goal was to generate a more accurate linelist for the 5.8 µm absorption band of HNO$_3$. Here, we report improved line positions and intensities in the ν$_2$ cold band which is the main band in this region. For this, we recorded four high-resolution Fourier transform spectra for the ν$_2$ band, centered at 1709.567 cm$^{−1}$, under different experimental conditions. Using these spectra, a new extended line position analysis was performed for the ν$_2$ band, leading to more accurate line positions. In parallel, individual line intensities were measured. It appears that, although the ν$_2$ band is mainly of B-type, it also possesses a (very) weak A-type component that cannot be ignored. Overall, the line intensities in this new database are about 8% weaker than those quoted presently in the HITRAN (https://hitran.org/) or GEISA (https://geisa.aeris-data.fr/) databases. Our final linelist for HNO$_3$ at 5.8 µm is provided as a supplement to this paper. It includes lines from the ν$_2$ band together with those of the ν$_2$+ν$_9$−ν$_9$, ν$_2$+ν$_6$−ν$_6$, and ν$_2$+ν$_7$−ν$_7$ associated hot bands that were generated during the first part of this study, described in the companion paper.

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Dates et versions

hal-03870734 , version 1 (24-11-2022)

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A. Perrin, L. Manceron, R. Armante, F. Kwabia-Tchana, P. Roy, et al.. The 5.8 µm absorption bands for nitric acid (H$^{14}$N$^{16}$O$^3$ ): line positions and intensities for the ν$_2$ band at 1709.567 cm$^{−1}$ and for its first associated hot bands (ν$_2$+ν$_9$-ν$_9$, ν$_2$+ν$_7$−ν$_7$ , ν$_2$ +ν$_6$ −ν$_6$ ). Molecular Physics, 2022, 120 (15-16), ⟨10.1080/00268976.2021.1998931⟩. ⟨hal-03870734⟩
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