Raman spectroscopy of reaction fields induced by plasma in supercritical CO{sub 2}

The characteristic microstructures of supercritical fluids, such as density fluctuation near the critical point, in reaction fields induced by low-temperature plasma were investigated by using Raman spectroscopy. It was found that the decrease in the density of CO{sub 2} during plasma generation was...

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Bibliographic Details
Published in:Applied physics letters 2009-04, Vol.94 (15)
Main Authors: Tomai, Takaaki, Terashima, Kazuo, Yui, Hiroharu, PRESTO-JST, Sanbanncyo 5, Chiyoda-ku, Tokyo 102-0075
Format: Article
Language:English
Subjects:
CARBON DIOXIDE
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
MICROSTRUCTURE
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PRESSURE RANGE
RAMAN SPECTRA
RAMAN SPECTROSCOPY
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Summary:The characteristic microstructures of supercritical fluids, such as density fluctuation near the critical point, in reaction fields induced by low-temperature plasma were investigated by using Raman spectroscopy. It was found that the decrease in the density of CO{sub 2} during plasma generation was less than 0.02 g/cm{sup 3} (critical density of CO{sub 2}:0.467 g/cm{sup 3}), when compared to the decrease in density of pure CO{sub 2} for a wide pressure range from gaseous to supercritical conditions. Moreover, it was experimentally verified that the density fluctuation observed near the critical point persists in the reaction field.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3116622