Spectroscopy of the $\mathbf{X^2Σ^+(v=2) \rightarrow A^2Π_{1/2}(v=1)}$ Transition in MgF: Hyperfine Structures and Spectroscopic Constants
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| Format: | Preprint |
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2026
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| _version_ | 1866914433758920704 |
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| author | Cho, Youngju Lee, Yongwoong Kwon, Kikyeong Roh, Seunghwan Lee, Giseok Chae, Eunmi |
| author_facet | Cho, Youngju Lee, Yongwoong Kwon, Kikyeong Roh, Seunghwan Lee, Giseok Chae, Eunmi |
| contents | We report spectroscopic results of the \(X^2Σ^+(v=2) \rightarrow A^2Π_{1/2}(v=1)\) transition in magnesium monofluoride (MgF). Using Doppler-free Laser-Induced Fluorescence (LIF) spectroscopy on the \(X^2Σ^+(v=2) \rightarrow A^2Π_{1/2}(v=1)\) transition, we resolved 47 hyperfine components distributed over 11 transition lines in X and A states. An effective Hamiltonian -- comprising contributions from vibrational, rotational, \(Λ\)-doubling, and hyperfine interactions -- was presented to model the energy structure of the \(A^2Π_{1/2}(v=1)\) state. The spectroscopic parameters, including the rotational constant, the \(Λ\)-doubling parameter, and the hyperfine interaction constants, were extracted using a least-square fitting and Markov Chain Monte Carlo (MCMC) procedure. Our study reveals that the spectroscopic constants show subtle changes compared to the \(A^2Π_{1/2}(v=0)\) state. These results provide critical spectroscopic benchmarks for optimizing optical cycling schemes in MgF, thereby advancing optical cycling efficiency in the magneto-optical trapping of MgF. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_29309 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spectroscopy of the $\mathbf{X^2Σ^+(v=2) \rightarrow A^2Π_{1/2}(v=1)}$ Transition in MgF: Hyperfine Structures and Spectroscopic Constants Cho, Youngju Lee, Yongwoong Kwon, Kikyeong Roh, Seunghwan Lee, Giseok Chae, Eunmi Atomic Physics We report spectroscopic results of the \(X^2Σ^+(v=2) \rightarrow A^2Π_{1/2}(v=1)\) transition in magnesium monofluoride (MgF). Using Doppler-free Laser-Induced Fluorescence (LIF) spectroscopy on the \(X^2Σ^+(v=2) \rightarrow A^2Π_{1/2}(v=1)\) transition, we resolved 47 hyperfine components distributed over 11 transition lines in X and A states. An effective Hamiltonian -- comprising contributions from vibrational, rotational, \(Λ\)-doubling, and hyperfine interactions -- was presented to model the energy structure of the \(A^2Π_{1/2}(v=1)\) state. The spectroscopic parameters, including the rotational constant, the \(Λ\)-doubling parameter, and the hyperfine interaction constants, were extracted using a least-square fitting and Markov Chain Monte Carlo (MCMC) procedure. Our study reveals that the spectroscopic constants show subtle changes compared to the \(A^2Π_{1/2}(v=0)\) state. These results provide critical spectroscopic benchmarks for optimizing optical cycling schemes in MgF, thereby advancing optical cycling efficiency in the magneto-optical trapping of MgF. |
| title | Spectroscopy of the $\mathbf{X^2Σ^+(v=2) \rightarrow A^2Π_{1/2}(v=1)}$ Transition in MgF: Hyperfine Structures and Spectroscopic Constants |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2603.29309 |