Accession Number : ADA114661

Title :   Chemical Reactions and Molecular Aggregation in Cryogenic Whole Air Sample Matrices.

Descriptive Note : Final rept. 1 Mar 80-30 Sep 81,

Corporate Author : PRINCETON UNIV NJ DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Calo,J M ; Fezza,R J ; Ryan,G F

PDF Url : ADA114661

Report Date : Jan 1982

Pagination or Media Count : 110

Abstract : Chemical reactions and molecular aggregation phenomena in cryogenic condensates associated with in-situ cryogenic whole air sampling of stratospheric species are examined. Results for two types of studies are reported. In the first type, the gas phase composition resulting from thermal desorption of pure and mixed condensates collected on the cold end of a mechanical, helium-cycle, cryogenic refrigerator is determined with mass spectrometry and NOx chemiluminescence (when possible). This technique was applied to studies of the reactions of nitric oxide and ozone upon thermal desorption. The most salient results were:(1) disproportionation of nitric oxide to nitrogen dioxide and nitrogen during desorption of pure nitric oxide condensate at levels exceeding 50%; (2) significant recombination of ozone upon flash desorption; and (3) oxidation of nitric oxide to nitrogen dioxide by zone upon desorption of nitric oxide/ozone condensates. The second technique involves the direct observation of species behavior in the cryogenic condensate upon warming with infrared spectrophotometry.

Descriptors :   *ATMOSPHERIC CHEMISTRY, *STRATOSPHERE, *CRYOGENICS, *REACTION KINETICS, AIR, SAMPLING, CHEMICAL REACTIONS, MASS SPECTROSCOPY, CHEMILUMINESCENCE, NITROGEN OXIDES, OZONE, CONDENSATION, DESORPTION, INFRARED SPECTROPHOTOMETERS, LABORATORY EQUIPMENT

Subject Categories : Atmospheric Physics
      Test Facilities, Equipment and Methods
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE