Assignment of collision-induced four-level double-resonance transitions in the 3$ν$${_3}$ ${\Leftarrow}$ $ν$${_3}$ spectral region of methane
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arXiv
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2025
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| author | Lehmann, Kevin K. Silander, Isak Hjältén, Adrian Rey, Michael Foltynowicz, Aleksandra |
| author_facet | Lehmann, Kevin K. Silander, Isak Hjältén, Adrian Rey, Michael Foltynowicz, Aleksandra |
| contents | Optical-optical double-resonance (OODR) spectroscopy using a narrow-linewidth pump and a frequency comb probe has previously been used to measure and assign sub-Doppler transitions in the 3$ν$${_3}$ ${\Leftarrow}$ $ν$${_3}$ spectral region [J. Chem. Phys. 161, 124311 (2024)] when pumping from the J = (7, A${_2}$) ground state. Doppler-broadened double-resonance transitions were also observed in those OODR spectra. In this paper, 68 of these Doppler-broadened transitions are assigned to four-level double-resonance transitions involving collisional transfer from the pumped A${_1}$ symmetry state to other A${_1}$ and A${_2}$ symmetry (I = 2 meta nuclear spin) levels of the $ν$${_3}$ fundamental state. Assignments are made using combination differences and comparison with the term values and intensities of lines predicted by a new effective Hamiltonian, the accuracy of which has been validated by the sub-Doppler transitions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_13644 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Assignment of collision-induced four-level double-resonance transitions in the 3$ν$${_3}$ ${\Leftarrow}$ $ν$${_3}$ spectral region of methane Lehmann, Kevin K. Silander, Isak Hjältén, Adrian Rey, Michael Foltynowicz, Aleksandra Chemical Physics Optical-optical double-resonance (OODR) spectroscopy using a narrow-linewidth pump and a frequency comb probe has previously been used to measure and assign sub-Doppler transitions in the 3$ν$${_3}$ ${\Leftarrow}$ $ν$${_3}$ spectral region [J. Chem. Phys. 161, 124311 (2024)] when pumping from the J = (7, A${_2}$) ground state. Doppler-broadened double-resonance transitions were also observed in those OODR spectra. In this paper, 68 of these Doppler-broadened transitions are assigned to four-level double-resonance transitions involving collisional transfer from the pumped A${_1}$ symmetry state to other A${_1}$ and A${_2}$ symmetry (I = 2 meta nuclear spin) levels of the $ν$${_3}$ fundamental state. Assignments are made using combination differences and comparison with the term values and intensities of lines predicted by a new effective Hamiltonian, the accuracy of which has been validated by the sub-Doppler transitions. |
| title | Assignment of collision-induced four-level double-resonance transitions in the 3$ν$${_3}$ ${\Leftarrow}$ $ν$${_3}$ spectral region of methane |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2506.13644 |