Microwave transitions in the rotational spectrum of carbonyl sulfide molecules provide a timing reference that can be used to develop chip-scale atomic clocks.
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Kitching, J. Molecular clock redux in miniature. Nat Electron 1, 384–385 (2018). https://doi.org/10.1038/s41928-018-0104-2
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DOI: https://doi.org/10.1038/s41928-018-0104-2
