The high resolution absorption spectrum of methane in the 10 800–14 000 cm<sup>−1</sup> region: literature review, new results and perspectives

Campargue, A.; Karlovets, E. V.; Vasilchenko, S. S.; Turbet, M.

doi:10.1039/d3cp02385k

Phys. Chem. Chem. Phys.

2023

DOI: 10.1039/d3cp02385k

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The high resolution absorption spectrum of methane in the 10 800–14 000 cm⁻¹ region: literature review, new results and perspectives

A. Campargue,

E. V. Karlovets,

S. S. Vasilchenko

et al.

Abstract: The recent development of high resolution spectrographs for exoplanetary research in the visible range makes suitable an improvement of our knowledge of the high resolution spectrum of methane. In this...

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2024

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Cited by 4 publications

References 113 publications

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Empirical rovibrational energy levels for methane

Kefala,

Boudon,

Yurchenko

et al. 2024

Journal of Quantitative Spectroscopy and Radiative Transfer

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Empirical rovibrational energy levels for methane

Kefala,

Boudon,

Yurchenko

et al. 2024

Journal of Quantitative Spectroscopy and Radiative Transfer

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Assignment and modeling of 13CH4 spectrum at 298 K in the lower part of the Tetradecad in the 4970–5300 cm−1 range

Starikova,

Sung,

Nikitin

et al. 2024

Journal of Quantitative Spectroscopy and Radiative Transfer

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Measurement and assignment of J = 5 to 9 rotational energy levels in the 9070–9370 cm−1 range of methane using optical frequency comb double-resonance spectroscopy

Hjältén,

Silva de Oliveira,

Silander

et al. 2024

The Journal of Chemical Physics

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We use optical–optical double-resonance spectroscopy with a continuous wave (CW) pump and a cavity-enhanced frequency comb probe to measure the energy levels of methane in the upper part of the triacontad polyad (P6) with higher rotational quantum numbers than previously assigned. A high-power CW optical parametric oscillator, tunable around 3000 cm−1, is consecutively locked to the P(7, A2), Q(7, A2), R(7, A2), and Q(6, F2) transitions in the ν3 band, and a comb covering the 5800–6100 cm−1 range probes sub-Doppler ladder-type transitions from the pumped levels with J′ = 6 to 8, respectively. We report 118 probe transitions in the 3ν3 ← ν3 spectral range with uncertainties down to 300 kHz (1 × 10−5 cm−1), reaching 84 unique final states in the 9070–9370 cm−1 range with rotational quantum numbers J between 5 and 9. We assign these states using combination differences and by comparison with theoretical predictions from a new ab initio-based effective Hamiltonian and dipole moment operator. This is the first line-by-line experimental verification of theoretical predictions for these hot-band transitions, and we find a better agreement of transition wavenumbers with the new calculations compared to the TheoReTS/HITEMP and ExoMol databases. We also compare the relative intensities and find an overall good agreement with all three sets of predictions. Finally, we report the wavenumbers of 27 transitions in the 2ν3 spectral range, observed as V-type transitions from the ground state, and compare them to the new Hamiltonian, HITRAN2020, ExoMol, and the WKMLC line lists.

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The high resolution absorption spectrum of methane in the 10 800–14 000 cm⁻¹ region: literature review, new results and perspectives

Abstract: The recent development of high resolution spectrographs for exoplanetary research in the visible range makes suitable an improvement of our knowledge of the high resolution spectrum of methane. In this...

Cited by 4 publications

References 113 publications

Empirical rovibrational energy levels for methane

Empirical rovibrational energy levels for methane

Assignment and modeling of 13CH4 spectrum at 298 K in the lower part of the Tetradecad in the 4970–5300 cm−1 range

Measurement and assignment of J = 5 to 9 rotational energy levels in the 9070–9370 cm−1 range of methane using optical frequency comb double-resonance spectroscopy

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The high resolution absorption spectrum of methane in the 10 800–14 000 cm−1 region: literature review, new results and perspectives

Abstract: The recent development of high resolution spectrographs for exoplanetary research in the visible range makes suitable an improvement of our knowledge of the high resolution spectrum of methane. In this...

Cited by 4 publications

References 113 publications

Empirical rovibrational energy levels for methane

Empirical rovibrational energy levels for methane

Assignment and modeling of 13CH4 spectrum at 298 K in the lower part of the Tetradecad in the 4970–5300 cm−1 range

Measurement and assignment of J = 5 to 9 rotational energy levels in the 9070–9370 cm−1 range of methane using optical frequency comb double-resonance spectroscopy

Contact Info

Product

Resources

About

The high resolution absorption spectrum of methane in the 10 800–14 000 cm⁻¹ region: literature review, new results and perspectives