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 (344Kb)
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28,262,000 Yen (FY1995; 6,838,000 Yen)
¡¡Stratospheric aerosol testing chember were assembled for diagnosing the heterogeneous reactions on polar stratospheric clouds(PSCs). At first, the chamber were tested of its performances and thereafter, we made some of modeled PSCs films composed from nitric-acid and water. We made also cooling test of liquid nitric-acid/water, sulfuric-acid/water and sulfuric-acid/nitric-acid/water solutions which is thought as precursor of PSCs.
¡¡The performance of the chamber were tested of its tempereture stability at 183K, of its property for leak and of gas purging property of optical pass of Fourier transformation infrared(FTIR) spectrometer. Resulting data indicated that the chamber has an ability to produce modeled PSCs.
¡¡Using nitric acid and water vapor, depositted solid films on KRS-5 substrate were characterized by infrared absorption spectra to ice, ¦Á-nitric acid trihydrate(NAT), ¦Â-NAT, nitric acid dihydrate(NAD), nitric acid monohydrate(NAM), and their amorphas phase from comparing with previous works of Ritzhaupt and Devlin,(1991) and Koehler et al.,(1992). As NAD and ¦Á-NAT changed into ¦Â-NAT phase during heating, it was expected that ¦Â-NAT is the most pronounced phase of end of the polar storartospheric winter.
¡¡The infrared and urtraviolet spectra of liquid nitric-acid/sulfuric-acid/water films upon cooling indicated that few percentages of nitric acid caused disappearance of water absorption peaks and 10% of sulfuric acid depressed freezing point of a solution more than 10K and caused absorption spectral peak toward high energy region.
PSCs, Heterogeneous Reactions, NAM, NAD, NAT, Ozone Layer