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一、引言1967年第13届国际计大会通过决议,把秒定义与铯原子跃迁频率联系起来,决定采用自由原子零场基态两个超精细能级跃迁的9 192 631 770个周期的持续时间为一秒,目
I. INTRODUCTION In 1967, the 13th International Conference of the General Assembly adopted a resolution linking the definition of seconds to the frequency of cesium atomic transitions. The duration of 9 192 631 770 cycles of two hyperfine level transitions of the ground state of the free atom zero field was determined to be One second, head