Abstract
The compaction of carbon dioxide in the pores of nanoporous silicon aerogel at near-critical temperatures has been studied by coherent anti-Stokes light scattering (CARS) spectroscopy. The density was determined by the shift of the vibrational line at 1388 cm $${}^{-1}$$ under isochoric heating from the subcritical temperature of 25.2 $${}^{\circ}$$ C to the supercritical one of 31.95 $${}^{\circ}$$ C. It was found that the density of carbon dioxide in nanopores near the critical temperature increases, exceeding the average value in the cuvette by about $${\sim}20\%$$ .
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