Laboratory-measured H2SO4-H2O-NH3 ternary homogeneous nucleation rates: Initial observations

Details Laboratory-measured H2SO4-H2O-NH3 ternary homogeneous nucleation rates: Initial observations Laboratory-measured H2SO4-H2O-NH3 ternary homogeneous nucleation rates: Initial observations

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3615818b&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 15, CiteID L15818

Physics

13

Geochemistry: Composition Of The Moon (0345, 4801, 4906), Geochemistry: Composition Of The Moon, Geochemistry: Composition Of The Moon (0426, 1610), Geochemistry: Composition Of The Moon

Scientific paper

We have measured nucleation rates of sulfuric acid-water-ammonia (H2SO4-H2O-NH3) ternary homogeneous nucleation (THN), with a fast flow nucleation reactor attached to two chemical ionization mass spectrometers (CIMSs) to measure H2SO4 and NH3 concentrations simultaneously. Under our experimental conditions with a temperature of 288 K and RH from 4-42% and initial [H2SO4] in the 108-109 cm-3 range and [NH3] from 10-50 ppbv (˜2 × 1011-1 × 1012 cm-3), the enhancement factor (EF) compared to the binary system ranges up to ˜1,000 depending on [H2SO4], [NH3] and RH; EF also exponentially increases with decreasing RH and decreasing initial [H2SO4]. The numbers of H2SO4 (9-10) and H2O molecules (6-15) in the critical clusters are reduced in the presence of NH3 [(6-8) and (4-10), respectively]; the number of NH3 molecules in the critical clusters is smaller than 2, under our experimental conditions.

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