Infrared spectra of phenanthrene particles generated by pulsed rapid expansion of CO2 solutions

Abstract

A new apparatus for the pulsed rapid expansion of supercritical solutions (RESS) is presented. Phenanthrene particles with diameters of 240 nm were generated by expanding dilute solutions of phenanthrene in CO₂. The number size distribution and the shape of the particles were analyzed off-line with scanning electron microscopy and on-line with a scanning mobility particle sizer and extinction measurements. From these investigations and from infrared spectra of the aerosol particles, refractive index data for phenanthrene were determined in the mid-infrared region of the spectrum.