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Utilizing wall collision broadening of O_2 absorption line for pore size assessment

机译:利用壁碰撞扩大O_2吸收线进行孔径评估

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The broadening of the P9P9 absorption line of oxygen molecules entrapped in the pores of nanoporous alumina is studied using Gas in Scattering Media Absorption Spectroscopy (GASMAS). A narrow band tunable vertical-cavity surface-emitting laser (VCSEL), with emission peaking around 763 nm, is used to scan over the absorption line of the oxygen A-band. The oxygen line broadening in alpha alumina discs of pore sizes 150 nm, 80 nm and 50 nm, are measured to be 3.8 GHz, 4.2 GHz, and 4.8 GHz, respectively, and compared with the measured open-air oxygen line broadening of 3.3 GHz. The oxygen line broadenings are correlated with studied samples pore sizes and are found to agree well with the line broadenings evaluated using a model based on collisions of confined oxygen molecules with the bulk sample pore walls.
机译:使用气体在散射介质吸收光谱(Gasmas)中研究捕获在纳米多孔氧化铝孔中的氧分子的P9P9吸收线的扩展。窄带可调垂直腔表面发射激光器(VCSEL),发射达到763nm的发射峰值,用于扫描氧气A带的吸收线。孔径150nm,80nm和50nm的α氧化铝盘中的氧线分别测量为3.8GHz,4.2GHz和4.8GHz,并与测量的3.3 GHz的露天氧气线相比。氧线宽度与研究样本孔径相关,并且发现使用基于限制氧分子的碰撞评估的线宽度与散装样品孔壁的碰撞进行评估。

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