Dictionary:Frequency standard

ADVERTISEMENT
From SEG Wiki
Revision as of 17:05, 14 November 2017 by Ariannacastrechini (talk | contribs) (Marked this version for translation)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Other languages:
English • ‎español


A hydrogen maser, based on its 1.420 405 757 68 GHz resonance frequency of a hyperfine transition of atomic hydrogen, is the most stable of atomic clocks. A cesium beam based on 9.192 631 770 GHz hyperfine transition of 133Cs atoms provides the SI standard. A rubidium vapor cell based on 6.834 682 605 GHz transition of 87RB atoms is the least expensive of atomic clocks. Vibrating quartz crystals provide the most common inexpensive standards.