水相中由X射线诱导的位点与能量选择的低能电子发射
Site- and Energy-Selective Low-Energy Electron Emission by X-Rays in Aqueous Phase
AI总结：
本文首次在水溶液中实验观测到RA-ICD过程，证明通过调谐激发X射线光子能量至溶剂化Ca$^{2+}$离子内壳层共振，可高效控制低能电子发射，为理解ICD在真实环境中的潜在应用奠定基础。
摘要：
通过分子间库仑衰变（ICD）从共振俄歇末态发射低能电子（RA-ICD）此前被描述为控制医疗辐射损伤的有前景方案，但迄今仅在原型原子和分子范德华二聚体及团簇中观察到。本文报告了在水溶液中实验观测到RA-ICD。我们证明，对于溶剂化的Ca$^{2+}$离子，通过将激发X射线的光子能量调谐至离子的内壳层共振，可以非常高效地控制电子发射。我们的结果迈出了下一步，从在相对简单的原型系统中证明RA-ICD，到理解ICD在现实场景中的相关性与潜在应用。
英文摘要：
Low-energy-electron emission from resonant Auger final states via intermolecular Coulombic decay (RA-ICD) has been previously described as a promising scenario for controlling radiation damage for medical purposes, but has so far only been observed in prototypical atomic and molecular van der Waals dimers and clusters. Here, we report the experimental observation of RA-ICD in aqueous solution. We show that for solvated Ca$^{2+}$ ions, the emission can be very efficiently controlled by tuning the photon energy of exciting X-rays to inner-shell resonances of the ions. Our results provide the next step from proving RA-ICD in relatively simple prototype systems to understanding the relevance and potential applications of ICD in real-life scenarios.
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