State-Selective Ionization and Trapping of Single H$_2^+$ Ions with (2+1) Multiphoton Ionization
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arXiv
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2025
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| author | Kim, Ho June Schmid, Fabian Holzapfel, David Kienzler, Daniel |
| author_facet | Kim, Ho June Schmid, Fabian Holzapfel, David Kienzler, Daniel |
| contents | We report on efficient rovibrational state-selective loading of single H$_2^+$ molecular ions into a cryogenic linear Paul trap using (2+1) resonance-enhanced multi-photon ionization (REMPI). The H$_2^+$ ions are created by resonant two-photon excitation of H$_2$ molecules from the $X\;^1Σ_g^+$ state to the $E,F\;^1Σ_g^+$ state, followed by non-resonant one-photon ionization. The H$_2^+$ ions are produced from residual gas and sympathetically cooled by a co-trapped, laser-cooled $^9$Be$^+$ ion. By tuning the wavelength of the REMPI laser, we observe the loading of single H$_2^+$ ions via the ($ν' = 0$, $L' = 0, 1, 2, 3$) rovibrational levels of the $E,F\;^1Σ_g^+$ intermediate state. We measure the success probability for the production of H$_2^+$ in the ($ν^+ = 0$, $L^+ = 1$) state via the ($ν' = 0$, $L' = 1$) level to be 85(6)% by quantum logic spectroscopy (QLS) of the hyperfine structure of this rovibrational state. Furthermore, we load an H$_2^+$ ion via the ($ν' = 0$, $L' = 2$) level and confirm its rovibrational state to be ($ν^+ = 0$, $L^+ = 2$) by QLS. We perform QLS probes on the ion over 19 h and observe no decay of the rotationally excited state. Our work demonstrates an efficient state-selective loading mechanism for single-ion, high-precision spectroscopy of hydrogen molecular ions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03625 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | State-Selective Ionization and Trapping of Single H$_2^+$ Ions with (2+1) Multiphoton Ionization Kim, Ho June Schmid, Fabian Holzapfel, David Kienzler, Daniel Atomic Physics Quantum Physics We report on efficient rovibrational state-selective loading of single H$_2^+$ molecular ions into a cryogenic linear Paul trap using (2+1) resonance-enhanced multi-photon ionization (REMPI). The H$_2^+$ ions are created by resonant two-photon excitation of H$_2$ molecules from the $X\;^1Σ_g^+$ state to the $E,F\;^1Σ_g^+$ state, followed by non-resonant one-photon ionization. The H$_2^+$ ions are produced from residual gas and sympathetically cooled by a co-trapped, laser-cooled $^9$Be$^+$ ion. By tuning the wavelength of the REMPI laser, we observe the loading of single H$_2^+$ ions via the ($ν' = 0$, $L' = 0, 1, 2, 3$) rovibrational levels of the $E,F\;^1Σ_g^+$ intermediate state. We measure the success probability for the production of H$_2^+$ in the ($ν^+ = 0$, $L^+ = 1$) state via the ($ν' = 0$, $L' = 1$) level to be 85(6)% by quantum logic spectroscopy (QLS) of the hyperfine structure of this rovibrational state. Furthermore, we load an H$_2^+$ ion via the ($ν' = 0$, $L' = 2$) level and confirm its rovibrational state to be ($ν^+ = 0$, $L^+ = 2$) by QLS. We perform QLS probes on the ion over 19 h and observe no decay of the rotationally excited state. Our work demonstrates an efficient state-selective loading mechanism for single-ion, high-precision spectroscopy of hydrogen molecular ions. |
| title | State-Selective Ionization and Trapping of Single H$_2^+$ Ions with (2+1) Multiphoton Ionization |
| topic | Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2509.03625 |