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采用分光光度计测定了60keV质子辐照后铝膜反射镜反射光谱的变化规律.用慢正电子湮没等分析技术研究了辐照损伤的微观机制.结果表明,当质子辐照主要作用于反射镜铝膜层中时反射镜在200—800nm波长范围内反射率随辐照剂量增加而下降.入射质子可对铝膜中的缺陷产生填充作用,减小铝膜中电子密度,增加弱束缚电子带间跃迁.紫外至可见光能量较高的波段可引起带间激发跃迁,使相应的谱段反射率下降,导致反射镜光学性能的退化.
The spectrophotometer was used to measure the change of reflection spectrum of aluminum mirror after 60keV proton irradiation.The microscopic mechanism of irradiation damage was studied by using slow positron annihilation technique.The results showed that when proton irradiation mainly act on the reflection mirror Reflectance decreases with the increase of irradiation dosage in the wavelength range of 200-800nm in the aluminum film layer. The incident proton can fill the defects in the aluminum film, reduce the electron density in the aluminum film and increase the weakly bound electron band Transition.Ultraviolet to the band of higher energy of visible light can cause the transition of excitation between bands and the reflectivity of the corresponding spectral bands decrease, which leads to the degradation of the optical performance of the mirror.