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Measurement and assignment of double-resonance transitions to the 8900-9100- cm-1 levels of methane
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-6191-7926
Université de Rennes, CNRS, IPR (Institut de Physique de Rennes), UMR 6251, Rennes, France.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0001-5790-2185
Umeå University, Faculty of Science and Technology, Department of Physics.
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2021 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 103, no 2, article id 022810Article in journal (Refereed) Published
Abstract [en]

Optical-optical double-resonance spectroscopy with a continuous wave pump and frequency comb probe allows measurement of sub-Doppler transitions to highly excited molecular states over a wide spectral range with high frequency accuracy. We report on assessment and characterization of sub-Doppler double-resonance transitions in methane measured using a 3.3-μm continuous wave optical parametric oscillator as a pump and a 1.67-μm frequency comb as a probe. The comb spectra were recorded using a Fourier transform spectrometer with comb-mode-limited resolution. With the pump tuned to nine different transitions in the ν3 fundamental band, we detected 36 ladder-type transitions to the 3ν3 overtone band region, and 18 V-type transitions to the 2ν3 overtone band. We describe in detail the experimental approach and the pump stabilization scheme, which currently limits the frequency accuracy of the measurement. We present the data analysis procedure used to extract the frequencies and intensities of the probe transitions for parallel and perpendicular relative pump-probe polarization. We compare the center frequencies and relative intensities of the ladder-type transitions to theoretical predictions from the TheoReTS and ExoMol line lists, demonstrating good agreement with TheoReTS.

Place, publisher, year, edition, pages
American Physical Society, 2021. Vol. 103, no 2, article id 022810
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-182118DOI: 10.1103/PhysRevA.103.022810ISI: 000617037900004Scopus ID: 2-s2.0-85100896234OAI: oai:DiVA.org:umu-182118DiVA, id: diva2:1543051
Funder
Knut and Alice Wallenberg Foundation, KAW 2015.0159Swedish Research Council, 2016-03593The Kempe Foundations, JCK 1317.1Available from: 2021-04-09 Created: 2021-04-09 Last updated: 2023-09-05Bibliographically approved

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Foltynowicz, AleksandraSilander, IsakJohansson, Alexandra C.Silva de Oliveira, ViniciusAxner, Ove

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Physical Review A: covering atomic, molecular, and optical physics and quantum information
Atom and Molecular Physics and Optics

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