H. Vortisch et al., Homogeneous freezing nucleation rates and crystallization dynamics of single levitated sulfuric acid solution droplets, PHYS CHEM P, 2(7), 2000, pp. 1407-1413
Supercooled sulfuric acid solution droplets are a major constituent of the
stratospheric background aerosol. We report the rate of homogeneous freezin
g and the crystallization dynamics of single levitated sulfuric acid soluti
on droplets with 0 to 57.6 wt.% H2SO4. The energy of formation of the criti
cal nucleus and the self-diffusion activation energy are deduced from the e
xperiments as a function of temperature and concentration. The results are
compared to both theoretical and experimental work of other groups.