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AGU: Journal of Geophysical Research, Atmospheres

 

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  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Chemical kinetic and photochemical properties
  • Atmospheric Composition and Structure: Ion chemistry of the atmosphere
  • Atmospheric Composition and Structure: Instruments and techniques
Abstract
Cited By (21)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 107, 4158, 18 PP., 2002
doi:10.1029/2001JD001100

Measurement of prenucleation molecular clusters in the NH3, H2SO4, H2O system

D. R. Hanson

Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA

F. L. Eisele

Atmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, Colorado, USA

The molecular cluster ions HSO4−(H2SO4)n−1(NH3)m corresponding to the neutral species (H2SO4)n(NH3)m for n = 2 to 6 and m = 0 to n−1 have been observed at temperatures up to ∼285 K. A transverse chemical ionization apparatus was located inside a cooled flow tube where water, sulfuric acid, and ammonia vapors mixed and formed clusters. The complexities of the experimental technique and the interpretation of the results are extensively discussed. Typical NH3 and H2SO4 concentrations were 2 × 109 cm−3, i.e, ∼100 pptv at atmospheric pressure. For these conditions, cluster concentrations were estimated to be a few times 106 cm−3 and the critical, particle-forming cluster likely contained 2 H2SO4 molecules at 275 K. The results are consistent with the species (H2SO4)2NH3 playing an important role in the formation of new particles in the atmosphere.

Published 29 June 2002.

Citation: Hanson, D. R., and F. L. Eisele (2002), Measurement of prenucleation molecular clusters in the NH3, H2SO4, H2O system, J. Geophys. Res., 107(D12), 4158, doi:10.1029/2001JD001100.

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