Pyridinium ions and pyridine in the free troposphere

Details Pyridinium ions and pyridine in the free troposphere Pyridinium ions and pyridine in the free troposphere

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1077s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, July 1990, p. 1077-1080. Research supported by BMFT.

Physics

4

Atmospheric Chemistry, Mass Spectrometers, Molecular Ions, Pyridines, Troposphere, Airborne Equipment, Atmospheric Composition, Positive Ions, Trace Contaminants

Scientific paper

Composition measurements of atmospheric positive ions were made in the middle troposphere (3000-6000 m) above central Europe using an improved aircraft-borne mass spectrometer. The by far most abundant core-ion species was found to be protonated pyridine, H(+)C5H5N, whose identification is strongly supported by in-flight electric-field-induced collisional-dissociation studies of this ion, resulting in fragment ions which are characteristic for H(+)C5H5N. Active-chemical-ionization mass spectrometry studies carried out on the same flights independently reveal the presence of a trace gas consistent with pyridine possessing a mole fraction of 1.6 parts per trillion by volume at about 4000-m altitude. The formation mechanism of H(+)C5H5N is briefly discussed.

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