Intensities of all fine-structure resolved rovibrational electric quadrupole absorption lines in 16O2 (X3Σg−) calculated with a new ab initio quadrupole moment curve

Abstract

The intensities of all rovibrational electric quadrupole absorption lines in ¹⁶O${}_2$ ($X^3{\Sigma }_g^{-}$), for which the vibrational quantum number is $v\le 35$ and the total angular momentum quantum number is $J\le 40$, are calculated in the intermediate coupling using a new 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, for quadrupole transitions, only the 1-0 fundamental vibrational band of ¹⁶O${}_2$ ($X^3{\Sigma }_g^{-}$). 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.