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Reference.org
Rubidium standard
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<p>A rubidium standard or rubidium atomic clock is a <a href="/facts/Frequency_standard/VrTvqGam">frequency standard</a> in which a specified <a href="/facts/Hyperfine_structure/aqj0dMut">hyperfine transition</a> of <a href="/facts/Electron/L0KBo5cW">electrons</a> in <a href="/facts/Rubidium/KDHSe2HM">rubidium</a>-87 atoms is used to control the output frequency. </p>