• Open Access

Observation of electric-quadrupole infrared transitions in water vapor

Alain Campargue, Samir Kassi, Andrey Yachmenev, Aleksandra A. Kyuberis, Jochen Küpper, and Sergei N. Yurchenko
Phys. Rev. Research 2, 023091 – Published 28 April 2020
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Abstract

Molecular absorption of infrared radiation is generally due to rovibrational electric-dipole transitions. Electric-quadrupole transitions may still occur, but they are typically a million times weaker than electric-dipole transitions, rendering their observation extremely challenging. In polyatomic or polar diatomic molecules, rovibrational quadrupole transitions have never been observed. Here, we report the direct detection of quadrupole transitions in water vapor. The detected quadrupole lines have intensity largely above the standard dipole intensity cutoff of spectroscopic databases and thus are important for accurate atmospheric and astronomical remote sensing.

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  • Received 8 January 2020
  • Accepted 16 March 2020

DOI:https://doi.org/10.1103/PhysRevResearch.2.023091

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Alain Campargue1,*, Samir Kassi1, Andrey Yachmenev2,3, Aleksandra A. Kyuberis4, Jochen Küpper2,3,5, and Sergei N. Yurchenko6

  • 1Université Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
  • 2Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
  • 3Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
  • 4Institute of Applied Physics, Russian Academy of Sciences, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
  • 5Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
  • 6Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom

  • *Corresponding author: alain.campargue@univ-grenoble-alpes.fr

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Vol. 2, Iss. 2 — April - June 2020

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