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A rubidium standard or rubidium atomic clock is a frequency standard in which a specified hyperfine transition of electrons in rubidium-87 atoms is used to control the output frequency.[1]
- ^ Riley, William J. Jr (December 2019). "A History of the Rubidium Frequency Standard" (PDF). IEEE Uffc-S. Archived (PDF) from the original on 2022-10-09.