Noble gas and liquid detectors rely on high chemical purity for successful operation. While gaseous purification has emerged as a reliable method of producing high-purity noble fluids, the requirement for large mass flows drives the development of liquid-phase purification. We constructed a medium-scale liquid argon (LAr) purification system based on a copper catalyst and 4 Å molecular sieve capable of purifying 1 t of commercial LAr 5.0 to a long effective triplet lifetime of τ₃ ∼ 1.3 μs. We further demonstrate that a quenched effective triplet lifetime of τ₃ ∼ 1 μs, due to contamination by air, can be recovered in loop-mode purification to τ₃ ∼ 1.3 μs after > 20 volume exchanges.

中文翻译：

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一种液相环路模式氩气纯化系统

稀有气体和液体探测器依靠高化学纯度才能成功运行。虽然气态纯化已成为生产高纯度稀有流体的可靠方法，但对大质量流量的需求推动了液相纯化的发展。我们构建了一个基于铜催化剂和 4 Å 分子筛的中型液氩 (LAr) 纯化系统，能够将 1 t 商用 LAr 5.0 纯化至 τ ₃ ∼ 1.3 μs 的长有效三线态寿命。我们进一步证明，由于空气污染，淬灭的有效三重态寿命为τ _{3 ∼ 1 μs，在> 20次体积交换后，可以在循环模式纯化中恢复到τ 3} ∼ 1.3 μs。