caesium transition frequency
... laser transition frequency 激光跃迁频率 caesium transition frequency 铯跃迁频率 standard frequency transition 标准频率跃迁 ...
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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.
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