Detection of massive negative chemiions in the exhaust plume of a jet aircraft in flight

Details Detection of massive negative chemiions in the exhaust plume of a jet aircraft in flight Detection of massive negative chemiions in the exhaust plume of a jet aircraft in flight

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1577a&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 11, p. 1577-1580

Other

13

Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere, Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Pollution-Urban And Regional, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

Gaseous negative ions were mass spectrometrically measured in the exhaust plume of a jet aircraft in flight. Using a quadrupole mass spectrometer operated in a high-pass mode, it was found that by far most of the ions had mass numbers >450 amu (atomic mass units) and number densities which markedly exceeded the number densities of ambient atmospheric ions. The latter were observed outside the exhaust plume and had mostly mass numbers <200 amu. Both their large numbers and large concentrations strongly suggest that the massive ions observed inside the plume are chemiions which were produced by the jet engines. The low fuel sulfur content (22 μg/g) suggests that the massive ions consist at least partly of species other than sulfuric acid. By interaction with exhaust gases these chemiions experienced rapid chemical transformation and growth in the early exhaust plume already at plume ages <0.4 s.

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