铯原子 Cesium Atom ; Cs atom
铯原子钟 caesium atomic clock ; CESIUM TIME AND FREQUENCY STANDARD
铯原子射束的频率标准 cesium atomic beam frequency standard
铯原子BEC Cs atomic BEC
铯原子束管 cesium atomic-beam tube
铯原子喷泉钟 Cs fountain clock
稳定性比铯原子钟 cesium atoms
铯原子喷泉 cesium fountain ; Cesium atomic fountain
铯原子束 caesium atomic beam
铯原子气室 Cesium vapor cell
所以，在1967年，SI采用了一个更为精确的制定办法，该办法基于一个铯原子在两个能级之间跃迁时的辐射频率。
Thus, in 1967, SI adopted a more precise definition based on the frequency of the radiation a caesium atom emits when it flips between two energy states.
比如说，秒就是根据铯原子内部的电子跃迁时间来下的定义，而米的定义则和光速有关。
A second of time, for instance, is now defined in terms of an electron transition of the cesium atom. And the meter is tied to the speed of light.
这一获得诺贝尔奖的发现产生了铯原子钟和氢微波激射器。
His discoveries, which won him the Nobel prize, led to the caesium atomic clock and the hydrogen maser.
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