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

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

2011-09-08

arxiv.org/abs/1109.1678v1

The Journal of Physical Chemistry Letters 2011 2 (17), 2174-2178

Physics

Chemical Physics

8 pages, 5 figures

Scientific paper

10.1021/jz200929y

Environmental molecular beam experiments are used to examine water interactions with liquid methanol films at temperatures from 170 K to 190 K. We find that water molecules with 0.32 eV incident kinetic energy are efficiently trapped by the liquid methanol. The scattering process is characterized by an efficient loss of energy to surface modes with a minor component of the incident beam that is inelastically scattered. Thermal desorption of water molecules has a well characterized Arrhenius form with an activation energy of 0.47{\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 water into the methanol layer. The implication for fundamental studies and environmental applications is that even an alcohol as simple as methanol can exhibit complex and temperature dependent surfactant behavior.

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