Uptake on Water Droplet

Since the uptake and evaporation of gaseous H2O molecules (water vapor) are very important as a microscopic process of cloud physics, many measurements and theoretical studies have been made from this viewpoint. From the perspective of atmospheric chemistry, it is worthy of study as a most fundamental process of uptake to the water surface among other many atmospheric molecules. 

Recent measurements of accommodation coefficients of H20(g) to H20(l) have been made mainly using a liquid droplet train flow reactor or liquid droplet growth method. Although the obtained values converge within 0.1 a 1, it has been pointed out that there is some discrepancy between the values obtained by both methods. For example, the values of a obtained by the liquid droplet train method of Li et al. (2001) are 0.17 0.03 and 0.32 0.04 at 280 and 258 K, while the value by 

Gas phase molecules Surface Products Uptake (accommodation) coefficients Temperature (K) References 

The uptake of an H2O molecule to the liquid H2O surface has been attracted interest from the molecular dynamics point of view and theoretical analysis has been made (Morita et al. 2003, 2004b Vieceli et al. 2004). From these theoretical analysis, a 1 has been obtained and the reason that experiments by the droplet train method gives the smaller values has been ascribed to the diffusion effect in the gas phase. 

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