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Environmental molecular beam experiments are used to examine waterinteractions with liquid methanol films at temperatures from 170 K to 190 K. Wefind that water molecules with 0.32 eV incident kinetic energy are efficientlytrapped by the liquid methanol. The scattering process is characterized by anefficient loss of energy to surface modes with a minor component of theincident beam that is inelastically scattered. Thermal desorption of watermolecules has a well characterized Arrhenius form with an activation energy of0.47{\pm}0.11 eV and pre-exponential factor of 4.6 {\times} 10^(15{\pm}3)s^(-1). We also observe a temperature dependent incorporation of incident waterinto the methanol layer. The implication for fundamental studies andenvironmental applications is that even an alcohol as simple as methanol canexhibit complex and temperature dependent surfactant behavior.

Collision Dynamics and Solvation of Water Molecules in a Liquid Methanol Film