The spectral dependence of the light‐induced magnetic states generated in zinc oxide nanoparticles by illumination during an electron paramagnetic resonance (EPR) experiment is studied for three incident light wavelengths (451, 405, and 370 nm). The minimal wavelength excitation is found to be in the visible violet region, very close to 405 nm for all of the light‐induced EPR lines. This points to a close relationship between their originating centers, despite the difference in their dynamics previously revealed by saturation recovery measurements. The study of the light‐induced signals decay with time (after illumination removal) and with temperature (under constant illumination) confirms the existence of two groups of lines characterized by different dynamics. The quite unusual persistence of these magnetic states after excitation removal opens promising possibilities for encoding information within semiconducting nanoparticles.

中文翻译：

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ZnO纳米粒子中的高阶光激发磁态

研究了三种入射光波长（451、405和370 nm）在电子顺磁共振（EPR）实验过程中通过照射在氧化锌纳米颗粒中产生的光致磁态的光谱依赖性。最小的波长激发被发现在可见的紫光区域，对于所有光诱导的EPR线都非常接近405 nm。这表明它们的起源中心之间存在密切的关系，尽管先前通过饱和度恢复测量揭示了它们的动力学差异。对光感应信号随时间（去除照明后）和温度（在恒定照明下）衰减的研究证实，存在着两组具有不同动态特性的线。