The beam-foil method was used to determine mean-lives of excited atomic states. Initial studies were done on states. Initial studies were done on states of the helium- and hydrogen-like ions B IV and B V, with the mean-lives determined by fitting the decay curves to sums of exponential terms. Since theoretical values of the mean-lives are very precise in these simple atomic systems, our results indicate the accuracy of the experimental method. A series of measurements was made of the low lying 2s 2p⁴ states in nitrogen-like Ne IV, Na V, Mg VI, Al VII, and Si VIII. The experimental results were compared to theoretical calculations of Fawcett and Sinanoglu, and showed excellent agreement with Sinanolu's nonclosed-shell many electron theory. The lifetimes of the 4p ²P₁/₂ and 4p ²P₃/₂ states in copper-like Br VII were determined by measuring decay curves for both the primary and cascade decays and then analyzing the curves jointly. Our resulting mean-life values are considerbly shorter than those of previous experiments which analyzed only the primary decay curve. Comparison with theoretical calculations showed excellent agreement with those which include core polarization effects.
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机译：束箔方法用于确定激发原子态的平均寿命。对州进行了初步研究。对类氦离子和氢离子B IV和B V的状态进行了初步研究，其平均寿命是通过将衰减曲线拟合为指数项之和来确定的。由于平均寿命的理论值在这些简单的原子系统中非常精确，因此我们的结果表明了该实验方法的准确性。对类似氮的Ne IV，Na V，Mg VI，Al VII和Si VIII的低位2s2p⁴态进行了一系列测量。将实验结果与Fawcett和Sinanoglu的理论计算进行了比较，并显示出与Sinanolu的非封闭壳多电子理论极好的一致性。通过测量一次衰变和级联衰变的衰减曲线，然后共同分析这些曲线，可以确定类似铜的Br VII中4p P / P和4p P / P的寿命。我们得到的平均寿命值比以前仅分析主要衰减曲线的实验的平均寿命短得多。与理论计算的比较表明，与包括磁芯极化效应在内的计算结果非常吻合。
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