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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.13060 |
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| _version_ | 1866910215534804992 |
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| author | de Oliveira, Vinicius Silva Silander, Isak Sasada, Hiroyuki Okubo, Sho Inaba, Hajima Lehmann, Kevin K. Foltynowicz, Aleksandra |
| author_facet | de Oliveira, Vinicius Silva Silander, Isak Sasada, Hiroyuki Okubo, Sho Inaba, Hajima Lehmann, Kevin K. Foltynowicz, Aleksandra |
| contents | Methane is a key spherical-top molecule, yet restrictive selection rules for one-photon transitions have prevented determination of its ground state (GS) energies with state-of-the-art kHz-level accuracy. We report the GS rotational energy level differences with kHz-level accuracy from two frequency-comb-referenced sub-Doppler methods: optical-optical double-resonance spectroscopy in the $Λ$-type configuration, and Lamb-dip spectroscopy of allowed and forbidden transitions. A Hamiltonian fit to the data yields GS term values with rotational numbers up to $\it{J}$ = 12 with kHz level accuracy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13060 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Rotational energy levels in the ground vibrational state of methane with kHz-level accuracy from comb-referenced double-resonance and Lamb-dip spectroscopies de Oliveira, Vinicius Silva Silander, Isak Sasada, Hiroyuki Okubo, Sho Inaba, Hajima Lehmann, Kevin K. Foltynowicz, Aleksandra Chemical Physics Methane is a key spherical-top molecule, yet restrictive selection rules for one-photon transitions have prevented determination of its ground state (GS) energies with state-of-the-art kHz-level accuracy. We report the GS rotational energy level differences with kHz-level accuracy from two frequency-comb-referenced sub-Doppler methods: optical-optical double-resonance spectroscopy in the $Λ$-type configuration, and Lamb-dip spectroscopy of allowed and forbidden transitions. A Hamiltonian fit to the data yields GS term values with rotational numbers up to $\it{J}$ = 12 with kHz level accuracy. |
| title | Rotational energy levels in the ground vibrational state of methane with kHz-level accuracy from comb-referenced double-resonance and Lamb-dip spectroscopies |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2605.13060 |