Negative ion composition measurements in the stratosphere

Physics

Scientific paper

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Atmospheric Composition, Mass Spectroscopy, Nitric Acid, Stratosphere, Sulfuric Acid, Balloon-Borne Instruments, Cryopumping, Fluid Filters, Particle Mass, Resolution

Scientific paper

Composition measurements of negative ions in the stratosphere were performed at altitudes near 35 km by means of a balloon borne quadrupole mass spectrometer during two balloon flights. Some typical ion spectra are shown and discussed. The observed ions were identified as NO3(-).nHNO3 and HSO4.HNO3.mH2SO4 HSO4(-).nHNO3.mH2SO4 clusters. Hydrated clusters of both ion families have also been detected. A reaction scheme is proposed to explain the data. The relative abundances of the ion mass peaks, as well as the measurement of minor constituents with large gas-phase acidities, such as HNO3 and H2SO4 are briefly discussed.

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