气态氙中近红外闪烁的波长分辨时间特性
Wavelength-Resolved Timing of Near-Infrared Scintillation in Gaseous Xenon
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中文总结 AI 辅助
本研究通过测量气态氙中α粒子在12个波长波段的近红外闪烁时间响应，揭示了快慢分量特性，并利用两步动力学模型及理论计算，识别出离子二聚体跃迁为连续谱发射的主要机制。
中文摘要 AI 辅助
氙的近红外（NIR）闪烁信号有潜力提升基于氙的探测器的性能，但对其特性的深入理解是其应用的前提。在本工作中，我们测量了气态氙中α粒子相互作用在跨越约(950-1620)纳米的12个波长波段内的近红外时间响应。时间响应被分解为快（纳秒级）分量和占主导的慢（微秒级）分量。快分量光谱与强原子发射线重合，主要为6p→6s跃迁，而慢分量光谱则遵循以约1.3微米为中心的宽连续谱。连续谱的压力依赖性可通过两步动力学模型描述，其中发射态由三体过程形成，并通过双体碰撞过程去布居，两个速率中均包含与密度无关的项。将其中较慢的过程解释为辐射衰变，得到约3微秒的固有寿命。理论计算确定了中性准分子跃迁0_u^- → 0_g^-和离子二聚体跃迁1/2_u → 1/2_g作为连续谱发射的可能候选，其中离子二聚体跃迁与测量结果总体吻合更好。
英文摘要
The near-infrared (NIR) scintillation signal of xenon has the potential to enhance the performance of xenon-based detectors, but a robust understanding of its properties is a prerequisite for its application. In this work, we measure the NIR time response for $α$-particle interactions in gaseous xenon in 12 wavelength bands spanning approximately $(950-1620)\,$nm. The time response is decomposed into a fast (ns-scale) component and a dominant slow ($μ$s-scale) component. The fast-component spectrum coincides with strong atomic emission lines, predominantly 6p$\,\to\,$6s, whereas the slow-component spectrum follows the broad continuum centred around $1.3\,μ$m. The pressure dependence of the continuum can be described by a two-step kinetic model in which the emitting state is formed by a three-body process and depopulated by a two-body collisional process, with density-independent terms in both rates. Interpreting the slower of these as radiative decay yields an intrinsic lifetime of $\sim3\,μ$s. Theoretical calculations identify a neutral-excimer transition $0_u^- \rightarrow 0_g^-$ and an ionic-dimer transition $1/2_{u} \rightarrow 1/2_g$ as plausible candidates for the continuum emission, with the ionic-dimer transition showing better overall agreement with the measurements.
发表机构
- Stanford University（斯坦福大学）
- Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）
- Universität Innsbruck（因斯布鲁克大学）
机构由 AI 辅助整理，请以论文原文为准。
