Investigation of a Cryogenic Matrix Isolation Approach for Characterizing Phosphorus Acid Aerosol

摘要

A matrix isolation cryostat has been adapted to sample gas streams containing aerosols for the latters subsequent analysis by infrared spectroscopy. The aerosol sampling was made in basically one of two modes: (1) the aerosol and its carrier gas were both condensed at 10K on the IR-transmitting surface, or (2) the aerosol alone was condensed on the IR-transmitting surface maintained at a temperature insufficient to condense the carrier gas. IR spectra of the condensed air + aerosol, or the aerosol alone, were then obtained. By suitably varying the temperature of the IR-transmitting surface, the air was distilled off leaving the aerosol behind. For aqueous aerosols containing non volatile solutes, the water could be partially or completely removed by raising the temperature of the condensed material to approximately 200K, followed by recooling to 10K for spectral analyses.