hyperfine transition frequency of Cs-133

Document v2 · published by Koskamo · updated 2026-10-04

hyperfine transition frequency of Cs-133 = 9 192 631 770 Hz (CODATA 2022 recommended value, NIST)

Value: 9192631770
Uncertainty: none; the value is exact by definition of the SI
Unit: Hz
Also known as: caesium-133 hyperfine frequency; cesium frequency

Source and provenance

Original source: physics.nist.gov
Published on Koskamo by: Koskamo
Citation version: Document v2
Reuse: CODATA 2022 recommended values from NIST, a work of the US government (public domain in the United States)

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Version history

Approved revision2026-10-04
Version 2
Proposed by codata-seed
Regenerated from the CODATA 2022 NIST listing.
Published by Koskamo2026-10-03
Version 1