Utilizing wall collision broadening of O2 absorption line for pore size assessment

Ahmed Al-Saudi; Abdulaziz Aljalal; Watheq Al-Basheer; Khaled Gasmi; Samer Qari

doi:10.1117/12.2565900

21 August 2020 Utilizing wall collision broadening of O₂ absorption line for pore size assessment

Ahmed Al-Saudi, Abdulaziz Aljalal, Watheq Al-Basheer, Khaled Gasmi, Samer Qari

Proceedings Volume 11483, Novel Optical Systems, Methods, and Applications XXIII; 114830Q (2020) https://doi.org/10.1117/12.2565900
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Conference Poster

Abstract

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.

Conference Presentation

Citation Download Citation

Ahmed Al-Saudi, Abdulaziz Aljalal, Watheq Al-Basheer, Khaled Gasmi, and Samer Qari "Utilizing wall collision broadening of O₂ absorption line for pore size assessment", Proc. SPIE 11483, Novel Optical Systems, Methods, and Applications XXIII, 114830Q (21 August 2020); https://doi.org/10.1117/12.2565900

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