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

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

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2 Citations (Scopus)


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 H2 16O, 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-H2 16O 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.

Original languageEnglish
Article number1708
JournalNature communications
Issue number1
Publication statusPublished - Dec 1 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Tóbiás, R., Furtenbacher, T., Simkó, I., Császár, A. G., Diouf, M. L., Cozijn, F. M. J., Staa, J. M. A., Salumbides, E. J., & Ubachs, W. (2020). Spectroscopic-network-assisted precision spectroscopy and its application to water. Nature communications, 11(1), [1708]. https://doi.org/10.1038/s41467-020-15430-6