Homogeneous nucleation rates for water

Wo¨lk, Judith; Viisanen, Yrjo¨; Strey, Reinhard
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p7
Academic Journal
Homogeneous nucleation rates of light (H[sub 2]O) and heavy (D[sub 2]O) water have been measured under identical conditions. Comparing the nucleation rates for H[sub 2]O and D[sub 2]O at the same respective vapor pressure p[sub v] and temperature T the rates differ by a factor of 2500. However, the individual data points superimpose, if compared at the same supersaturation, i.e., they are the same within experimental scatter. Onset supersaturations S[sub 0] for H[sub 2]O at nucleation rates of J[sub 0] = 10[sup 7] cm[sup -3]s[sup -1] compared with previous measurements by Viisanen et al. (Viisanen, Y., Strey, R., and Reiss, H., J. Chem. Phys., 99, 4680 (1993); Erratum: Viisanen, Y., Strey, R., and Reiss, H., J. Chem. Phys., (2000) in press) show fair agreement. Predictions by the classical nucleation theory — using the most recent expressions for temperature-dependent vapor pressure, surface tension and density — are compared to the experimental data. While the predictions correctly yield the slope of the experimental nucleation rate curves and for one temperature (for H[sub 2]O T = 240 K) even the correct absolute rate, the temperature dependence is experimentally shown to be weaker.


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