cesium resonance

Cesium resonance refers to the precise frequency at which cesium atoms naturally oscillate when exposed to specific microwave radiation. This resonance is fundamental to atomic clocks because it enables extremely accurate time measurement. When microwaves match the cesium atoms’ vibrational frequency, they cause the atoms to resonate or "tick" in perfect unison. By measuring this resonance with high precision, cesium-based clocks can keep time to within billionths of a second over millions of years, providing the standard for Coordinated Universal Time (UTC) worldwide.