Caesium standard

（重定向自Cesium clock）

A caesium standard or caesium atomic clock is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency. The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK.

单词	Cesium clock
释义	Cesium clock 原声例句 TED-Ed（视频版） Cesium was already a popular element for atomic clock research, and by 1968, some cesium clocks were even commercially available. 铯已经是原子钟研究的热门元素，到 1968 年，一些铯钟甚至可以商用。英语百科 Caesium standard （重定向自Cesium clock） A caesium standard or caesium atomic clock is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency. The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK.
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