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FTIR studies of low temperature sulfuric acid aerosols
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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 (H2SO4) 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 H2SO4/H2O aerosols with compositions from 35 to 95 wt % H2SO4 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 % H2SO4 resulted in ice formation.
American Geophysical Union (AGU)
Title: FTIR studies of low temperature sulfuric acid aerosols
Description:
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 (H2SO4) 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 H2SO4/H2O aerosols with compositions from 35 to 95 wt % H2SO4 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 % H2SO4 resulted in ice formation.
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