Intensities of all fine-structure resolved rovibrational electric quadrupole absorption lines in $^{16}$O$_2$($X^{3}\Sigma^{-}_{g}$) calculated with a new $\textit{ab initio}$ quadrupole moment curve

TL;DR

This paper calculates all electric quadrupole rovibrational line intensities for $^{16}$O$_2$ using a new ab initio quadrupole moment curve, providing data to improve the HITRAN database for atmospheric and astrophysical applications.

Contribution

It introduces a comprehensive set of calculated quadrupole line intensities for $^{16}$O$_2$, extending the data beyond the fundamental band and aiding database updates.

Findings

Calculated line intensities agree with existing HITRAN data for the fundamental band.

Provides new data for vibrational overtones and hot bands of $^{16}$O$_2$.

Recommends updating HITRAN with these results in 2024.

Abstract

The intensities of all rovibrational electric quadrupole absorption lines in $^{16}$O$_2$($X^{3}\Sigma^{-}_{g}$), for which the vibrational quantum number is $v \leq 35$ and the total angular momentum quantum number is $J \leq 40$, are calculated in the intermediate coupling using a new $\textit{ab initio}$ quadrupole moment curve of the ground electronic state of O$_2$. The calculated values agree with those available in the HITRAN database, which at present includes only the $1$-$0$ fundamental vibrational band of $^{16}$O$_2$($X^{3}\Sigma^{-}_{g}$). We therefore recommend using the intensities of the vibrational overtones and hot bands reported here in updating the HITRAN database for O$_2$ in the upcoming 2024 edition.