We have observed that the collisional frequency shift in primary caesium fountain clocks varies with the clock state population composition and, in particular, is zero for a given fraction of the |F = 4, mF = 0> atoms, depending on the initial cloud parameters. We present a theoretical model explaining our observations. The possibility of the collisional shift cancellation implies an improvement in the performance of caesium fountain standards and a simplification in their operation. Our results also have implications for test operation of fountains at multiple pi/2 pulse areas.
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机译：我们已经观察到，初级铯喷泉时钟中的碰撞频率偏移随时钟状态总体组成而变化，并且，对于| F = 4的给定分数，mF = 0>原子，尤其是零，具体取决于初始云参数。我们提供一个理论模型来解释我们的观察。碰撞偏移抵消的可能性意味着铯源标准液的性能得到改善，并且简化了其操作。我们的结果也对在多个pi / 2脉冲区域上的喷泉进行测试操作产生影响。
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