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Sub-Doppler optical-optical double-resonance spectroscopy using a cavity-enhanced frequency comb probe

Author

Listed:
  • Vinicius Silva de Oliveira

    (Umeå University)

  • Isak Silander

    (Umeå University)

  • Lucile Rutkowski

    (IPR (Institut de Physique de Rennes)-UMR 6251)

  • Grzegorz Soboń

    (Wrocław University of Science and Technology)

  • Ove Axner

    (Umeå University)

  • Kevin K. Lehmann

    (University of Virginia)

  • Aleksandra Foltynowicz

    (Umeå University)

Abstract

Accurate parameters of molecular hot-band transitions, i.e., those starting from vibrationally excited levels, are needed to accurately model high-temperature spectra in astrophysics and combustion, yet laboratory spectra measured at high temperatures are often unresolved and difficult to assign. Optical-optical double-resonance (OODR) spectroscopy allows the measurement and assignment of individual hot-band transitions from selectively pumped energy levels without the need to heat the sample. However, previous demonstrations lacked either sufficient resolution, spectral coverage, absorption sensitivity, or frequency accuracy. Here we demonstrate OODR spectroscopy using a cavity-enhanced frequency comb probe that combines all these advantages. We detect and assign sub-Doppler transitions in the spectral range of the 3ν3 ← ν3 resonance of methane with frequency precision and sensitivity more than an order of magnitude better than before. This technique will provide high-accuracy data about excited states of a wide range of molecules that is urgently needed for theoretical modeling of high-temperature data and cannot be obtained using other methods.

Suggested Citation

  • Vinicius Silva de Oliveira & Isak Silander & Lucile Rutkowski & Grzegorz Soboń & Ove Axner & Kevin K. Lehmann & Aleksandra Foltynowicz, 2024. "Sub-Doppler optical-optical double-resonance spectroscopy using a cavity-enhanced frequency comb probe," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44417-2
    DOI: 10.1038/s41467-023-44417-2
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    References listed on IDEAS

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    1. Olivier Berné & Marie-Aline Martin-Drumel & Ilane Schroetter & Javier R. Goicoechea & Ugo Jacovella & Bérenger Gans & Emmanuel Dartois & Laurent H. Coudert & Edwin Bergin & Felipe Alarcon & Jan Cami &, 2023. "Formation of the methyl cation by photochemistry in a protoplanetary disk," Nature, Nature, vol. 621(7977), pages 56-59, September.
    2. Mark R. Swain & Gautam Vasisht & Giovanna Tinetti, 2008. "The presence of methane in the atmosphere of an extrasolar planet," Nature, Nature, vol. 452(7185), pages 329-331, March.
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