Growth of nitric acid hydrates on thin sulfuric acid films

Details Growth of nitric acid hydrates on thin sulfuric acid films Growth of nitric acid hydrates on thin sulfuric acid films

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..867i&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 10, p. 867-870

Physics

22

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry

Scientific paper

Type I polar stratospheric clouds (PSCs) are thought to nucleate and grow on stratospheric sulfate aerosols (SSAs). To model this system, thin sulfuric acid films were exposed to water and nitric acid vapors (1-3×10-4 Torr H2O and 1-2.5×10-6 Torr HNO3) and subjected to cooling and heating cycles. FTIR spectroscopy was used to probe the phase of the sulfuric acid and to identify the HNO3/H2O films that condensed. Nitric acid trihydrate (NAT) was observed to grow on crystalline sulfuric acid tetrahydrate (SAT) films. NAT also condensed in/on supercooled H2SO4 films without causing crystallization of the sulfuric acid. This growth is consistent with NAT nucleation from ternary solutions as the first step in PSC formation.

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