Abstract
The grazing-angle reflection spectra of nitric acid/water-ice particles deposited on a cold finger were recorded in the infrared region as a model of polar stratospheric clouds (PSCs). The observed spectra were compared with experimental transmission spectra and theoretically predicted extinction spectra of particles, which are available in literature. The grazing-angle reflection spectra of water-ice and nitric acid mono-hydrate (NAM) agree well with both the transmission and simulation spectra. On the other hand, those of nitric acid tri-hydrate (NAT) exhibit the character of the liquid phase spectra of aqueous nitric acid solution; considerably different from the transmission spectra of crystalline NAT. The differences can be explained in terms of the formation of liquid on the surface of the particles.
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