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physics.atom-ph2026

Optically Derived Radio-Frequency Benchmark in Methanol: A Sub-kHz Reference for Astrophysical Tests of Fundamental Physics

Frank M. J. Cozijn, Arthémise Altman, Alexandr S. Bogomolov +8

The authors determine the absolute frequency of a key 12.2 GHz methanol transition by measuring related near‑infrared rovibrational lines with an optical frequency comb, achieving…