Ca II的4P ~（3/2）衰变分支分数的精确测量
Precision measurement of the branching fractions of the 4P3/2 decay of Ca II
摘要：
我们对悬浮在线性Paul阱中的单个~（40）Ca ~+离子的~（4P）3/2能级衰变的分支比进行了精确测量。高精度是通过一种新的技术实现的基础上监测人口转移时，反复泵离子之间的不同内部状态。4S_（1/2）、3D_（5/2）和3D_（3/2）能级的分支分数分别为0.9347（3）、0.0587（2）和0.00661（4）。对于分支比A（P3/2-S1/2）/ \sum_J A（P3/2-D_J）=14.31（5），我们发现与以前最好的测量相比，精度提高了40倍。
英文摘要：
We perform precision measurements of the branching ratios of the 4P3/2 level decay of a single 40Ca+ ion suspended in a linear Paul trap. High precision is achieved by a novel technique based on monitoring the population transfer when repeatedly pumping the ion between different internal states. The branching fractions into the 4S1/2, 3D5/2 and 3D3/2 levels are found to be 0.9347(3), 0.0587(2) and 0.00661(4), respectively. For the branching ratio A(P3/2-S1/2)/\sum_J A(P3/2-D_J)=14.31(5), we find a forty-fold improvement in accuracy as compared to the best previous measurement.
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