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.

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。

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In this paper a cesium beam maser is proposed in which the optically pumping state selection technique by two laser beams is used together with the atom storage bulb technique.

本文提出一种铯原子束激射器的建议，其中利用了双束激光抽运选态技术和原子贮存泡方法。

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In the experiment at Bonn, the researchers fired two lasers in sequence at a single atom of cesium, moving it to the left or right.

MSN: Franken-Physics: Atoms split in two �� and put back together