Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 22, 2020
Previous Article Next Article

Detection of electric-quadrupole transitions in water vapour near 5.4 and 2.5 μm

Author affiliations

Abstract

Nowadays, the spectroscopic databases used for the modeling of Earth and planetary atmospheres provide only electric-dipole transitions for polyatomic molecules (H2O, CO2, N2O, CH4, O3…). Very recently, electric-quadrupole transitions have been detected in the high sensitivity cavity ring down spectrum (CRDS) of water vapour near 1.3 μm [A. Campargue et al., Phys. Rev. Res., 2020, 2, 023091, DOI: 10.1103/PhysRevResearch.2.023091]. This discovery paved the way to systematic searches of quadrupole transitions in water vapor and other polyatomic molecules. In the present work, on the basis of high accuracy ab initio predictions, H216O quadrupole lines are detected for the first time in the 5.4 μm and 2.5 μm regions where they are predicted to have their largest intensities (up to 10−26 cm per molecule). A total of twelve quadrupole lines are identified in two high sensitivity Fourier transform spectra recorded with a 1064 m path length. Ten lines in the 4030–4150 cm−1 region are assigned to the ν3 band while the lines near 1820 and 1926 cm−1 belong to the ν2 band. The derived line intensities which are largely above the dipole intensity cut-off of the standard spectroscopic databases, agree nicely with the theoretical predictions. We thus conclude that the calculated line list of quadrupole transitions, validated by the present measurements, should be incorporated in the spectroscopic databases.

Graphical abstract: Detection of electric-quadrupole transitions in water vapour near 5.4 and 2.5 μm

Back to tab navigation

Article information


Submitted
27 Mar 2020
Accepted
14 May 2020
First published
20 May 2020

Phys. Chem. Chem. Phys., 2020,22, 12476-12481
Article type
Paper

Detection of electric-quadrupole transitions in water vapour near 5.4 and 2.5 μm

A. Campargue, A. M. Solodov, A. A. Solodov, A. Yachmenev and S. N. Yurchenko, Phys. Chem. Chem. Phys., 2020, 22, 12476
DOI: 10.1039/D0CP01667E

Social activity

Search articles by author

Spotlight

Advertisements