Dynamics of proton attachment to water cluster: Proton transfer, evaporation, and relaxation Thermochemical aspects of the cooling of isolated liquid drops by evaporation are considered, with explicit reference to amorphous water. Monte Carlo simulations are used to examine the role of fluctuations in energy dissipation and the effect oflocal stabilities on the terminal cluster size. Kinetic aspects of the cooling are then considered. We establish the pertinence of our studies to clusters generated in sonic nozzle expansions, and show that they will be metastable. We then find that a given mass-selected cluster will comprise a broad range of internal energies. Severe constraints on the kinetic modeling of evaporation patterns are thus imposed. These are illustrated by reference to data in the literature. 5854

van der Waals molecules as prepared in the laboratory are often found to be evaporating. Recent work has shown, sometimes by fiat, sometimes by calculation, that this can actually serve to characterize them precisely. The present article recapitulates these developments, establishes their roots in unimolecular reaction theory, and clarifies their limitations. Applications in a number of laboratory settings are noted.

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