High-sensitivity detection of negative ions in the stratosphere

Details High-sensitivity detection of negative ions in the stratosphere High-sensitivity detection of negative ions in the stratosphere

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..136m&link_type=abstract

Nature, vol. 294, Nov. 12, 1981, p. 136-139. Bundesministerium für Forschung und Technologie

Computer Science

Sound

16

Anions, Atmospheric Composition, Atmospheric Sounding, Balloon Sounding, Stratosphere, Balloon-Borne Instruments, Cryogenic Equipment, Fluid Filters, Ligands, Mass Spectra, Nitric Acid

Scientific paper

High-sensitivity, in situ measurements of the negative ion composition of the stratosphere are presented which have led to the detection of previously unobserved ion species. The balloon-borne measurements were made by an instrument consisting of a cryogenically pumped quadrupole mass filter with single ion detection by a channel electron multiplier operating in a pulse-saturated ion counting mode, with an ion detection limit of about 1 ion/cu cm. Mass spectra taken during a daytime flight over southwestern France at a float altitude of 34 km reveal the presence of ions in the families NO3(-)(HNO3)(a) and HSO4(-)(H2SO4)(b)(HNO3)(c) at fractional ion count rates between 0.9 and 6.5%. Minor ions detected at count rates between 0.05 and 0.4% include those containing NO3(-) and HSO4(-) cores, as well as CN(-) and CO3 and CO3(-).H2O. Ligands identified for these molecules include HNO3 and H2SO4 and, tentatively, H2O, HCl, HNO2 and HOCl. An atmospheric nitric acid concentration of 7 x 10 to the 7th/cu cm is estimated on the basis of the NO3(-) and HNO3 species data.

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