Quantitative Analysis of the Infrared Absorptivities of Nitric Acid Ices Aerosol Existing in Polar Stratospheric CloudsQuantitative Analysis of the Infrared Absorptivities of Nitric Acid Ices Aerosol Existing in Polar Stratospheric Clouds

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 Author Tso, T. -L ♦ Leu, M. -T Source J-STAGE Content type Text Publisher The Japan Society for Analytical Chemistry Language English
 Subject Keyword Infrared absorptivity ♦ nitric acid ice ♦ polar stratospheric cloud ♦ remote sensing ♦ Fourier-transform infrared spectroscopy Abstract The infrared absorptivities of nitric acid ices formed from vapors containing water and nitric acid were investigated by means of a Fourier-transform infrared spectrometer operated at a wavelength resolution of $1.0cm^{-1}$ (triangular apodization). The solid films were prepared on the surface of a gold-coated, polished copper plate at a temperature of 153 K to 198 K. After collecting the infrared spectra, the substrates were vaporized and condensed into a U-tube for quantitative analyses of $H_{2}O$ and $HNO_{3}$ using a quadrupole mass spectrometer. Amorphous forms of nitric acid ices and four crystalline hydrates (nitric acid monohydrate (NAM), nitric acid dihydrate (NAD), and nitric acid trihydrate (both α-NAT and β-NAT forms)) were identified and their infrared absorptivities measured. The infrared spectra were interpreted in terms of the known spectra of oxonium and nitrate ions. Possible implications for remote sensing and the analysis of polar stratospheric clouds using these infrared spectra are discussed. ISSN 09106340 Learning Resource Type Article Publisher Date 1996-08-10 e-ISSN 13482246 Journal Analytical Sciences(analsci1985) Volume Number 12 Issue Number 4 Page Count 8 Starting Page 615 Ending Page 622