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在铯束频率基准中,腔相位差公式中的原子有效速度V_P和二级Doppler效应公式中的原子有效速度v_D都是难于确定的,因为它们与实际的原子速度分布有关。如果根据Ramsey曲线半强度处的线宽W和作用区总长度L定义一个原子有效速度v_w,v_w≡2LW,并用v_w替代v_P和v_D,则在大多数情况下由于此种替代引起的误差在10~-(15)量级。v_w甚易通过对各种速度分布的线宽W的测量实验来确定。
In the cesium beam frequency reference, the atomic effective velocity V_P in the cavity phase difference formula and the atomic effective velocity v_D in the second-order Doppler effect formula are both difficult to determine because they are related to the actual atomic velocity distribution. If an atomic effective velocity v_w, v_w≡2LW is defined based on the line width W at the half-intensity of the Ramsey curve and the total length of the active region L and v_P and v_D are replaced by v_w, the error due to such substitution is in most cases 10 ~ - (15) on the order of magnitude. v_w very easy to pass through the various speed distribution of the line width W measurement experiment to determine.