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Nucleation rates of nitric acid dihydrate in 1∶2 HNO 3 /H 2 O solutions at stratospheric temperatures
Author(s) -
Salcedo Dara,
Molina Luisa T.,
Molina Mario J.
Publication year - 2000
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 - 10.1029/1999gl010991
Subject(s) - nitric acid , nucleation , analytical chemistry (journal) , chemistry , materials science , mineralogy , inorganic chemistry , environmental chemistry , organic chemistry
Nucleation rates of nitric acid dihydrate (NAD) in 1∶2 HNO 3 /H 2 O solutions between 194 and 183 K were measured by observing the freezing behavior of liquid drops with 7 – 33 µm diameter and with concentration of 64 weight percent HNO 3 using an optical microscopy technique. The nucleation rate increases from 3.1×10 5 cm −3 s −1 at 194 K to 1.3x10 9 cm −3 s −1 at 183 K. These results suggest that NAD might not nucleate homogeneously in binary or quasi‐binary nitric acid stratospheric aerosols in relevant time scales.