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Formation And Escaping Of Positronium In Porous Sio_2 Films At Low Temperature

机译:低温下多孔Sio_2薄膜中正电子的形成与逸出

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Positronium formation and escaping has been studied in porous silica thin films at temperature ranging from 13 to 300 K by 2-3 gamma ratio of positronium (3γ-PAS) measurements. Nanoporous silica thin films were deposited by spin coating on p-type (100) Si substrates and thermal treated in air at temperatures of 600 ℃. Two different molar ratios of porogen (polyvinylpyrrolidone) were used in the TEOS-ethanol mixture to obtain samples with close porosity and connected porosity with the surfaces. In both types of sample a reduction of the 2-3 gamma ratio of positronium was observed by decreasing the temperature. This finding, in disagreement with the theoretical expectation, is discussed on the basis of the possible quenching mechanisms.
机译:通过在2-3 gamma的正电子ron(3γ-PAS)测量中在13至300 K的温度范围内研究了多孔二氧化硅薄膜中正电子的形成和逸出。通过旋涂将纳米多孔二氧化硅薄膜沉积在p型(100)Si衬底上,并在空气中于600℃的温度下进行热处理。在TEOS-乙醇混合物中使用两种不同摩尔比的致孔剂(聚乙烯吡咯烷酮)获得具有紧密孔隙率和与表面相连的孔隙率的样品。在两种类型的样品中,通过降低温度都可以观察到2-3伽马比的降低。在可能的淬灭机理的基础上讨论了这一发现,与理论预期不一致。

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