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

Svensson, Tomas LU ; Lewander, Märta LU and Svanberg, Sune LU (2010) In Optics Express 18(16). p.16460-16473
Abstract
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.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
18
issue
16
pages
16460 - 16473
publisher
OSA
external identifiers
  • wos:000281042400019
  • pmid:20721033
  • scopus:77955628926
ISSN
1094-4087
DOI
10.1364/OE.18.016460
language
English
LU publication?
yes
id
5bc9c951-cf04-425d-91fb-72d710dcf1ed (old id 1665201)
date added to LUP
2010-09-08 15:43:42
date last changed
2018-05-29 11:27:01
@article{5bc9c951-cf04-425d-91fb-72d710dcf1ed,
  abstract     = {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.},
  author       = {Svensson, Tomas and Lewander, Märta and Svanberg, Sune},
  issn         = {1094-4087},
  language     = {eng},
  number       = {16},
  pages        = {16460--16473},
  publisher    = {OSA},
  series       = {Optics Express},
  title        = {Laser absorption spectroscopy of water vapor confined in nanoporous alumina: wall collision line broadening and gas diffusion dynamics.},
  url          = {http://dx.doi.org/10.1364/OE.18.016460},
  volume       = {18},
  year         = {2010},
}