Hyperfine structure and <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>K</mi></math> doubling in the <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>RaOCH</mi><mn>3</mn></msub></math> molecule

Alexander Petrov

doi:10.1103/59xq-73bs

Letter

Hyperfine structure and $K$ doubling in the ${RaOCH}_{3}$ molecule

Alexander Petrov ^*

Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre “Kurchatov Institute,” 1, mkr. Orlova Roshcha, Gatchina 188300, Russia and Saint Petersburg State University, 7/9 Universitetskaya nab., Saint Petersburg 199034, Russia

^*Contact author: petrov_an@pnpi.nrcki.ru

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Phys. Rev. A 112, L030802 – Published 24 September, 2025

DOI: https://doi.org/10.1103/59xq-73bs

Abstract

The ${RaOCH}_{3}$ molecule is one of the most sensitive systems for electron electric dipole moment ( $e EDM$ ) searches. Its hyperfine and $K − doubling$ structure in the external electric field is of key importance for preparing and interpreting the experiment. We proposed the method for calculation of the symmetric top molecules and applied it for ${RaOCH}_{3}$ . Hyperfine structure, $K$ doubling, and sensitivity of the molecule to $e EDM$ in the external electric field were calculated.

Physical Review A

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Hyperfine structure and $K$ doubling in the ${RaOCH}_{3}$ molecule

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Hyperfine structure and K doubling in the RaOCH3 molecule

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Hyperfine structure and $K$ doubling in the ${RaOCH}_{3}$ molecule