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Effect of atmosphere on recovery of diffuse reflection spectra of ZnO powder modified with nanoparticles upon irradiation in vacuum

机译：纳米颗粒在真空照射时用纳米颗粒改性ZnO粉末弥漫反射光谱的影响

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摘要

The changes of diffuse reflection spectra (p lambda) in the range 0.2-2.2 mu m and the integral absorption coefficient of solar radiation (as) of ZnO powder modified with SiO2 nanoparticles were studied. These changes were recorded in vacuum at the site of irradiation of the samples (in situ) after irradiation (30 keV electrons, 5 keV protons, and solar spectrum quanta (SSQ)), as well as upon exposure the samples to the atmosphere. It was found that for all types of irradiation, a significant recovery of the p lambda spectra in the near-IR region in the atmosphere is recorded. The recovery is 1.5 times for the samples irradiated with electrons and solar spectrum quanta, and 1.1 times for the sample irradiated with protons. In the visible region, absorption is due to the intrinsic point defects of ZnO, the reflection coefficient is not only not restored in the atmosphere, but it even decreases (1-3%). Mechanism of formation of photo- and radiation defects under these types and parameters of irradiation is explained; the processes of restoration of the p lambda spectra of the modified ZnO powder are considered.
机译：研究了用SiO2纳米颗粒改性的ZnO粉末的0.2-2.2μmm和太阳辐射的整体吸收系数的漫反射光谱（pλ）的变化。在照射后（30keV电子，5keV质子和太阳光谱Quanta（SSQ）的样品（30keV电子，5keV质子和太阳光谱Quanta（SSQ））的情况下，在样品（原位）的照射部位的真空中记录这些变化。以及暴露于大气中的样品。发现，对于所有类型的照射，记录大气中的近红外区域中的Pλ光谱的显着恢复。用电子和太阳光谱Quanta照射的样品的回收是1.5倍，并用质子照射样品的1.1次。在可见区域中，吸收是由于ZnO的内在点缺陷，反射系数不仅在大气中恢复，而且甚至降低（1-3％）。解释了如此类型的照射参数和辐射缺陷的形成机制;考虑了改性ZnO粉末的PLAMBDA光谱的恢复过程。

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