• Accepted Paper

Adiabatic passage of 205TlF with microwaves in a cryogenic beam

Olivier Grasdijk, Jakob Kastelic, Jianhui Li, Oskari Timgren, Konrad Wenz, Yuanhang Yang, Pengyu Zhou, David Kawall, Tanya Zelevinsky, and David DeMille

Phys. Rev. A - Accepted 13 November, 2026

DOI: https://doi.org/10.1103/gkks-9cjv

Abstract

We present a hyperfine-resolved state transfer scheme for thallium fluoride (TlF) molecules, based on microwave-driven adiabatic passage (AP) in a spatially varying electric field. This method enables population transfer between selected |J,mJ=0⟩ hyperfine sublevels of the X1Σ+ 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, and the second transfers from J=1 to J=2. Transfer efficiencies are quantified through laser-induced fluorescence. We achieve a total efficiency of 0.95(7) for population transfer from J=0 to J=2, where the uncertainty represents a 95% statistical interval. These results demonstrate robust and high-fidelity preparation of specific rotational/hyperfine states in TlF.

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