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the claim
Atomic clocks are measured against microwave transitions of cesium atoms
the verdict
SUPPORTED
the evidence backs this
confidence 85/100

Atomic clocks traditionally rely on the microwave transitions of cesium atoms, which form the basis for the definition of the SI second.

Evidence for · 4
A low phase noise microwave frequency synthesis for a high-performance cesium vapor cell atomic clock
2014 · cited by 38
Paper 0 details a microwave frequency synthesis chain for a cesium vapor cell atomic clock operating at 9.192 GHz.
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More for · 3
Frequency shifts in a cesium atomic clock due to Majorana transitions
1993 · cited by 36
Paper 1 models frequency shifts in cesium atomic clocks caused by Majorana transitions interacting with the microwave resonator.
Towards the optical second: verifying optical clocks at the SI limit.
2019 · cited by 16
Paper 2 references primary cesium reference standards whose definitions are based on the microwave hyperfine transition in 133Cs.
1-MHz linewidth VCSEL enabled by monolithically integrated passive cavity for high-stability chip-scale atomic clocks.
2026 · cited by 1
Paper 5 discusses a VCSEL integrated into a cesium vapor-cell atomic clock operating near the cesium D1 line.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 8501 Aug 2026
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