Luminescence quenching of the triplet excimer state by air traces in gaseous argon
Luminescence quenching of the triplet excimer state by air traces in gaseous argon
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DOI：
10.1088/1748-0221/3/02/p02001
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发表时间：
2008-02-01
影响因子：
1.3
通讯作者：
Rochet, J.
中科院分区：
文献类型：
--
作者：
Amsler, C.;Boccone, V.;Rochet, J.
研究了空气污染对常压氩气中VUV闪烁产率的影响。我们用一个放射性α源测定了不同分气压和不同反射器和波长移位器下的光子产率。我们发现慢闪烁组分的时间常数取决于气体纯度，是VUV总产光率的一个很好的指标，而快闪烁组分不受影响。这种依赖是由于杂质破坏了长寿命的三态氩准分子态。在1100毫巴氩气和室温条件下，α -粒子的慢速准分子态和快速准分子态的居群比为5.5 +/- 0.6。在2 × 10（-6）毫巴的分气压下，慢速组分的衰减时间常数为3.140 +/- 0.067 μ s。
The influence of air contamination on the VUV scintillation yield in gaseous argon at atmospheric pressure is investigated. We determine with a radioactive alpha-source the photon yield for various partial air pressures and different reflectors and wavelength shifters. We find that the time constant of the slow scintillation component depends on gas purity and is a good indicator for the total VUV light yield, while the fast component is not affected. This dependence is attributed to impurities destroying the long-lived triplet argon excimer state. The population ratio between the slow and the fast decaying excimer states is determined for alpha-particles to be 5.5 +/- 0.6 in argon gas at 1100 mbar and room temperature. The measured decay time constant of the slow component is 3.140 +/- 0.067 mu s at a partial air pressure of 2 x 10(-6) mbar.