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Sub-Doppler optical-optical double-resonance spectroscopy using a cavity-enhanced frequency comb probe
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-5627-1497
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0001-5790-2185
University of Rennes, CNRS, IPR (Institut de Physique de Rennes)-UMR 6251, Rennes, France.
Faculty of Electronics, Photonics and Microsystems, Wrocław University of Science and Technology, Wrocław, Poland.
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2024 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 15, no 1, article id 161Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Springer Nature, 2024. Vol. 15, no 1, article id 161
National Category
Atom and Molecular Physics and Optics
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URN: urn:nbn:se:umu:diva-219329DOI: 10.1038/s41467-023-44417-2PubMedID: 38167498Scopus ID: 2-s2.0-85181230228OAI: oai:DiVA.org:umu-219329DiVA, id: diva2:1827204
Funder
Knut and Alice Wallenberg Foundation, KAW 2015.0159Knut and Alice Wallenberg Foundation, KAW 2020.0303Swedish Research Council, 2020-00238The Kempe Foundations, JCK 1317.1Available from: 2024-01-12 Created: 2024-01-12 Last updated: 2024-01-12Bibliographically approved

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Silva de Oliveira, ViniciusSilander, IsakAxner, OveFoltynowicz, Aleksandra

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