IR spectroscopy of water vapor confined in nanoporous silica aerogel

The absorption spectrum of the water vapor, confined in the nanoporous silica aerogel, was measured within 5000-5600 cm(-1) with the IFS 125 HR Fourier spectrometer. It has been shown, that tight confinement of the molecules by the nanoporous size leads to the strong lines broadening and shift. For...

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Bibliographic Details
Published in:Optics express 2010-12, Vol.18 (25), p.26062-26067
Main Authors: Ponomarev, Yu N, Petrova, T M, Solodov, A M, Solodov, A A
Format: Article
Language:English
Subjects:
Air
Gases - analysis
Nanostructures - chemistry
Nanostructures - ultrastructure
Porosity
Silica Gel - analysis
Silica Gel - chemistry
Spectrophotometry, Infrared - methods
Water - analysis
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Summary:The absorption spectrum of the water vapor, confined in the nanoporous silica aerogel, was measured within 5000-5600 cm(-1) with the IFS 125 HR Fourier spectrometer. It has been shown, that tight confinement of the molecules by the nanoporous size leads to the strong lines broadening and shift. For water vapor lines, the HWHM of confined molecules are on the average 23 times larger than those for free molecules. The shift values are in the range from -0.03 cm(-1) to 0.09 cm(-1). Some spectral lines have negative shift. The data on the half-widths and center shifts for some strongest H(2)O lines have been presented.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.18.026062