Line intensities of the 01111–00001 magnetic dipole absorption band of 12C16O2: Laboratory measurements

Electric-quadrupole and magnetic-dipole contributions to the ν2+ν3 band of carbon dioxide near 3.3 µm

“…5) are overestimated by nearly a factor of two compared to the empirical intensity values of Ref. [24] validated by our present measurements. We have no explanation for this disagreement.…”

“…The detectivity threshold of the recordings corresponds to an intensity threshold of about 10 -29 cm/molecule which is at the state-of-the-art for the spectral region near 3.3 µm. Recent high sensitivity FTS spectrum with an absorption pathlength of 1058 m [24] reported only "M1" lines in the same region.…”

“…[14] for the E2 band and (ii) empirical intensities of M1 transitions calculated using a refined value of the effective dipole moment (EDM) parameter derived in Ref. [24]. The new fit of the M1 EDM parameter should use as input data the P, Q and R line intensities measured by FTS [24] and OFCEAS with P and R line intensities decreased by the corresponding E2 ab initio values (about 20 %) as experimental P and R line intensities involve both M1 and E2 contributions.…”

The update of the line positions and intensities in the line list of carbon dioxide for the HITRAN2020 spectroscopic database

“…16. The 01111-00001 magnetic dipole band of the main CO2 isotopologue [56,58]. The band center of this band is 3004.012 cm -1 .…”

“…The detailed studies of this band providing the selection rules for the vibration-rotation transitions are presented in Refs [53,55]. The vibrational transition magnetic dipole moment of the 01111-00001 band was fitted to the line intensities measured with a Bruker IFS 125 HR FTS and a 30 m base multipass gas cell of the V.E.Zuev Institute of Atmospheric Optics SB RAS [56]. The line positions and intensities of this band were computed using the vibrational transition magnetic dipole moment and the set of the effective Hamiltonian parameters reported by Majcherova et al [57].…”