Positron annihilation lifetime spectroscopy (PALS) using a low-energy positron microbeam extracted into air was applied to elucidating molecular-level pore structures formed in silicon-oxide-backboned microporous thin films under controlled humidity conditions; as a result, a direct observation of the interstitial spaces in the micropores filled with water molecules was achieved. It was demonstrated that PALS using a microbeam extracted into air in combination with water vapor adsorption is a powerful tool for the in-situ elucidation of both open and closed subnanoscaled pores of functional thin materials under practical conditions.

中文翻译：

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低能正电子湮没所见的微孔二氧化硅薄膜上水蒸气吸附过程中的亚纳米孔填充

使用提取到空气中的低能正电子微束的正电子湮没寿命光谱 (PALS) 被应用于阐明在受控湿度条件下在氧化硅骨架微孔薄膜中形成的分子级孔结构；结果，实现了对充满水分子的微孔中间隙空间的直接观察。结果表明，使用提取到空气中的微束与水蒸气吸附相结合的 PALS 是在实际条件下原位阐明功能性薄材料的开放和封闭亚纳米级孔隙的有力工具。