Utilizing wall collision broadening of O2absorption line for pore size assessment

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationNovel Optical Systems, Methods, and Applications XXIII
EditorsCornelius F. Hahlweg, Joseph R. Mulley
ISBN (Electronic)9781510637726
StatePublished - 2020

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Bibliographical note

Publisher Copyright:
© 2020 SPIE.


  • Alpha alumina
  • Gas in scattering media absorption spectroscopy
  • Oxygen line broadening
  • Wall collision broadening

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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