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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.16626 |
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| _version_ | 1866911277553549312 |
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| author | Grasdijk, Olivier Kastelic, Jakob Li, Jianhui Timgren, Oskari Wenz, Konrad Yang, Yuanhang Zhou, Perry Kawall, David Zelevinsky, Tanya DeMille, David |
| author_facet | Grasdijk, Olivier Kastelic, Jakob Li, Jianhui Timgren, Oskari Wenz, Konrad Yang, Yuanhang Zhou, Perry Kawall, David Zelevinsky, Tanya DeMille, David |
| contents | We present a hyperfine-resolved state preparation scheme for thallium fluoride (TlF) molecules based on microwave-driven adiabatic passage (AP) in a spatially varying electric field. This method enables efficient and robust population transfer between selected $\left|J,m_J=0\right\rangle$ hyperfine sublevels of the $X\,^1Σ^+_0$ ground state in a cryogenic molecular beam, a key requirement for the CeNTREX search for nuclear time-reversal symmetry violation. Two sequential stages of AP are implemented. The first transfers population from $J=0$ to $J=1$ at a local field of $173~\mathrm{V/cm}$, and the second transfers from $J=1$ to $J=2$ at $110~\mathrm{V/cm}$. Transfer efficiencies are quantified through laser-induced fluorescence, and accounting for residual population in excited rotational levels after a prior stage of rotational cooling. We achieve state transfer efficiencies of $0.92(6)$ and $1.05(5)$ for the first and second states of AP, respectively. This corresponds to a total efficiency of $0.97(8)$ for population transfer from $J=0$ to $J=2$. These results demonstrate robust and high-fidelity preparation of specific rotational/hyperfine states in TlF. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_16626 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Adiabatic passage of $^{205}$TlF with microwaves in a cryogenic beam Grasdijk, Olivier Kastelic, Jakob Li, Jianhui Timgren, Oskari Wenz, Konrad Yang, Yuanhang Zhou, Perry Kawall, David Zelevinsky, Tanya DeMille, David Atomic Physics We present a hyperfine-resolved state preparation scheme for thallium fluoride (TlF) molecules based on microwave-driven adiabatic passage (AP) in a spatially varying electric field. This method enables efficient and robust population transfer between selected $\left|J,m_J=0\right\rangle$ hyperfine sublevels of the $X\,^1Σ^+_0$ ground state in a cryogenic molecular beam, a key requirement for the CeNTREX search for nuclear time-reversal symmetry violation. Two sequential stages of AP are implemented. The first transfers population from $J=0$ to $J=1$ at a local field of $173~\mathrm{V/cm}$, and the second transfers from $J=1$ to $J=2$ at $110~\mathrm{V/cm}$. Transfer efficiencies are quantified through laser-induced fluorescence, and accounting for residual population in excited rotational levels after a prior stage of rotational cooling. We achieve state transfer efficiencies of $0.92(6)$ and $1.05(5)$ for the first and second states of AP, respectively. This corresponds to a total efficiency of $0.97(8)$ for population transfer from $J=0$ to $J=2$. These results demonstrate robust and high-fidelity preparation of specific rotational/hyperfine states in TlF. |
| title | Adiabatic passage of $^{205}$TlF with microwaves in a cryogenic beam |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2511.16626 |