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Spectroscopic-network-assisted precision spectroscopy and its application to water

Author

Listed:
  • Roland Tóbiás

    (Institute of Chemistry)

  • Tibor Furtenbacher

    (Institute of Chemistry)

  • Irén Simkó

    (Institute of Chemistry)

  • Attila G. Császár

    (Institute of Chemistry)

  • Meissa L. Diouf

    (Vrije Universiteit)

  • Frank M. J. Cozijn

    (Vrije Universiteit)

  • Joey M. A. Staa

    (Vrije Universiteit)

  • Edcel J. Salumbides

    (Vrije Universiteit)

  • Wim Ubachs

    (Vrije Universiteit)

Abstract

Frequency combs and cavity-enhanced optical techniques have revolutionized molecular spectroscopy: their combination allows recording saturated Doppler-free lines with ultrahigh precision. Network theory, based on the generalized Ritz principle, offers a powerful tool for the intelligent design and validation of such precision-spectroscopy experiments and the subsequent derivation of accurate energy differences. As a proof of concept, 156 carefully-selected near-infrared transitions are detected for H216O, a benchmark system of molecular spectroscopy, at kHz accuracy. These measurements, augmented with 28 extremely-accurate literature lines to ensure overall connectivity, allow the precise determination of the lowest ortho-H216O energy, now set at 23.794 361 22(25) cm−1, and 160 energy levels with similarly high accuracy. Based on the limited number of observed transitions, 1219 calibration-quality lines are obtained in a wide wavenumber interval, which can be used to improve spectroscopic databases and applied to frequency metrology, astrophysics, atmospheric sensing, and combustion chemistry.

Suggested Citation

  • Roland Tóbiás & Tibor Furtenbacher & Irén Simkó & Attila G. Császár & Meissa L. Diouf & Frank M. J. Cozijn & Joey M. A. Staa & Edcel J. Salumbides & Wim Ubachs, 2020. "Spectroscopic-network-assisted precision spectroscopy and its application to water," Nature Communications, Nature, vol. 11(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15430-6
    DOI: 10.1038/s41467-020-15430-6
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