FTIR studies of low temperature sulfuric acid aerosols | Zendy

Anthony S. E. | Zendy; Tisdale R. T. | Zendy; Disselkamp R. S. | Zendy; Tolbert M. A. | Zendy; Wilson J. C. | Zendy

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FTIR studies of low temperature sulfuric acid aerosols

Author(s) -

Anthony S. E.,

Tisdale R. T.,

Disselkamp R. S.,

Tolbert M. A.,

Wilson J. C.

Publication year - 1995

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/95gl01031

Subject(s) - sulfuric acid , fourier transform infrared spectroscopy , analytical chemistry (journal) , nucleation , aerosol , sulfate , spectroscopy , materials science , chemistry , chemical engineering , inorganic chemistry , environmental chemistry , organic chemistry , physics , quantum mechanics , engineering

Fourier transform infrared (FTIR) spectroscopy was used to study low temperature sulfuric acid aerosols representative of global stratospheric sulfate aerosols (SSAs). Sub‐micrometer sized sulfuric acid (H 2 SO 4 ) particles were generated using a constant output atomizer source. The particles were then exposed to water vapor before being injected into a low temperature cell. Multipass transmission FTIR spectroscopy was used to determine the phase and composition of the aerosols as a function of time for periods of up to 5 hours. Binary H 2 SO 4 /H 2 O aerosols with compositions from 35 to 95 wt % H 2 SO 4 remained liquid for over 3 hours at temperatures ranging from 189–240 K. These results suggest that it is very difficult to freeze SSAs via homogeneous nucleation. Attempts to form aerosols more dilute than 35 wt % H 2 SO 4 resulted in ice formation.

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