Storing keV Negative Ions for an Hour: The Lifetime of the Metastable 2P1/2o level in 32S-
Storing keV Negative Ions for an Hour: The Lifetime of the Metastable 2P1/2o level in 32S-
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DOI：
10.1103/physrevlett.114.143003
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发表时间：
2015-04-06
影响因子：
8.6
通讯作者：
Cederquist, H.
中科院分区：
文献类型：
--
作者：
Backstrom, E.;Hanstorp, D.;Cederquist, H.
我们用一种新的静电离子储存环测量了S-32（-）中3 p（5）P-2（1/2）o -> 3 p（5）P-2（32）o自发辐射衰变的上能级辐射寿命为503 +/- 54秒。从数量级上讲，这是在带负电荷的离子中测得的最长寿命。储存环的低温冷却提供了在13 K下数倍于10（-14）mbar的残余气体压力和超过一小时的10 keV硫阴离子的储存。我们的实验结果与唯一可用的理论预测相差1.3 σ [P. Andersson et al.，A 73，032705（2006）]。
We use a novel electrostatic ion storage ring to measure the radiative lifetime of the upper level in the 3p(5) P-2(1/2)o -> 3p(5) P-2(3/2)o spontaneous radiative decay in S-32(-) to be 503 +/- 54 sec. This is by orders of magnitude the longest lifetime ever measured in a negatively charged ion. Cryogenic cooling of the storage ring gives a residual-gas pressure of a few times 10(-14) mbar at 13 K and storage of 10 keV sulfur anions for more than an hour. Our experimental results differ by 1.3 sigma from the only available theoretical prediction [P. Andersson et al., Phys. Rev. A 73, 032705 (2006)].