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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 16 — Aug. 2, 2010
  • pp: 16460–16473

Laser absorption spectroscopy of water vapor confined in nanoporous alumina: wall collision line broadening and gas diffusion dynamics

Tomas Svensson, Märta Lewander, and Sune Svanberg  »View Author Affiliations

Optics Express, Vol. 18, Issue 16, pp. 16460-16473 (2010)

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We demonstrate high-resolution tunable diode laser absorption spectroscopy (TDLAS) of water vapor confined in nanoporous alumina. Strong multiple light scattering results in long photon pathlengths (1 m through a 6 mm sample). We report on strong line broadening due to frequent wall collisions (gas-surface interactions). For the water vapor line at 935.685 nm, the HWHM of confined molecules are about 4.3 GHz as compared to 2.9 GHz for free molecules (atmospheric pressure). Gas diffusion is also investigated, and in contrast to molecular oxygen (that moves rapidly in and out of the alumina), the exchange of water vapor is found very slow.

© 2010 Optical Society of America

OCIS Codes
(020.3690) Atomic and molecular physics : Line shapes and shifts
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(160.4236) Materials : Nanomaterials

ToC Category:

Original Manuscript: May 18, 2010
Revised Manuscript: July 1, 2010
Manuscript Accepted: July 1, 2010
Published: July 21, 2010

Tomas Svensson, Märta Lewander, and Sune Svanberg, "Laser absorption spectroscopy of water vapor confined in nanoporous alumina: wall collision line broadening and gas diffusion dynamics," Opt. Express 18, 16460-16473 (2010)

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