Raman spectroscopy of reaction fields induced by plasma in supercritical CO2

Tomai, Takaaki; Yui, Hiroharu; Terashima, Kazuo
April 2009
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p151501
Academic Journal
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 CO2 during plasma generation was less than 0.02 g/cm3 (critical density of CO2:0.467 g/cm3), when compared to the decrease in density of pure CO2 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.


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