放射性示踪剂光致发光用于色心的元素特异性识别
Radiotracer photoluminescence for element-specific identification of color centers
AI总结：
本研究在CERN的ISOLDE装置上搭建放射性示踪剂光致发光光谱系统，结合放射性离子注入与光学光谱学，成功实现金刚石中色心的元素特异性识别，为宽禁带材料色心研究提供新方法。
AI中文摘要：
我们报告了在欧洲核子研究组织（CERN）的ISOLDE放射性离子束装置上实现的放射性示踪剂光致发光光谱系统，该系统可对固体中的光学活性缺陷进行元素特异性识别。该方法将放射性离子注入与光学光谱学相结合，能够将光致发光信号的时间演化与核衰变直接关联。目前该系统针对金刚石及相关宽禁带材料中的色心进行了优化，可实现室温测量。系统由光学显微镜、光纤耦合的Czerny-Turner光谱仪以及液氮冷却的CCD探测器组成，具备长时间测量所需的稳定性。作为原理验证，我们将放射性$^{75}$Ga注入金刚石，作为生成$^{75}$Ge杂质的前驱体。对应于已知GeV$^-$中心的、从600 nm延伸的光致发光带呈现指数衰减，其半衰期为$82.3^{+2.5}_{-2.3}$ min，与已知$^{75}$Ge的β$^-$衰变半衰期82.78(4) min一致。这建立了观测到的光谱特征与其锗起源之间直接且明确的关联。这些结果证明了该系统开展元素特异性光学光谱学的能力，并利用ISOLDE可提供的独特宽范围放射性同位素，将放射性示踪剂方法扩展到宽禁带材料中的色心研究。
英文摘要：
We report on the implementation of a radiotracer photoluminescence spectroscopy setup at the ISOLDE radioactive ion beam facility at CERN, enabling element-specific identification of optically active defects in solids. The method combines radioactive ion implantation with optical spectroscopy, allowing the temporal evolution of photoluminescence signals to be correlated directly with nuclear decay. The setup is currently optimized for color centers in diamond and related wide-bandgap materials and enables room-temperature measurements. The system consists of an optical microscope coupled to a fiber-fed Czerny-Turner spectrometer with a liquid-nitrogen-cooled CCD detector, providing the stability required for long-duration measurements. As a proof-of-principle, radioactive $^{75}$Ga was implanted into diamond as a precursor to produce $^{75}$Ge impurities. The photoluminescence band extending from 600 nm, corresponding to the well-known GeV$^{-}$ center, exhibits an exponential decay with a half-life of $82.3^{+2.5}_{-2.3} \mathrm{min}$, in agreement with the known $β^{-}$ decay half-life of $^{75}$Ge of $82.78(4) \mathrm{min}$. This establishes a direct and unambiguous correlation between the observed spectral feature and its germanium origin. These results demonstrate the capability of the setup to perform element-specific optical spectroscopy and extend radiotracer methods to color centers in wide-bandgap materials, taking advantage of the uniquely broad range of radioactive isotopes available at ISOLDE.
