AI 中文总结
本研究利用NV中心NMR光谱观测到5.6 nm通道中限域水的长寿命自旋有序，发现其质子共振偶发分裂为双峰，归因于激光引发的电荷复合物介导的超精细相互作用，揭示了限域水的特殊亚稳态。
AI 中文摘要
限域在纳米尺度几何结构中的液体表现出与体相液体显著不同的行为，但在可控条件下研究其动力学仍面临实验挑战。本研究采用氮空位（NV）中心核磁共振（NMR）光谱，探测限域在5.6 nm通道中的水随温度的变化，该体系在研究的整个温度范围内保持液态，且扩散率被显著抑制，可直接检测其1H NMR光谱。质子共振偶尔会分裂为间距数十千赫兹的双峰，研究人员初步将其归因于长寿命顺磁电荷复合物介导的超精细相互作用，而该复合物由激光照射时光注入的溶剂化电子引发。该特征的间歇性出现表明，存在一种亚稳态，包含延伸至整个限域液体的电荷-水合复合物的关联群体。
英文摘要
Liquids confined to nanometer-scale geometries exhibit behavior that departs markedly from their bulk counterparts, yet studying their dynamics under controlled conditions remains experimentally challenging. Here, we use nitrogen-vacancy (NV) center nuclear magnetic resonance (NMR) spectroscopy to probe water confined in 5.6 nm channels as a function of temperature. The system remains liquid throughout the investigated temperature range and exhibits strongly suppressed diffusivity, enabling direct detection of its 1H NMR spectrum. Occasionally, the proton resonance transforms into a doublet with a splitting of several tens of kilohertz, which we tentatively attribute to hyperfine interactions mediated by long-lived paramagnetic charge complexes, in turn seeded by solvated electrons optically injected during laser illumination. The intermittent appearance of this feature suggests a metastable state comprising a correlated population of charge-hydration complexes extending throughout the confined liquid.
