Jung-Hwan Kim, Young-Kwang Kim, Heon Kang
Jan 8, 2009
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Journal
Journal of Physical Chemistry C
Abstract
We have examined the hydrolysis reaction of Na atoms at the surface of thin water−ice films by using the techniques of Cs+ reactive ion scattering and low energy sputtering. Na atoms are adsorbed onto amorphous D2O−ice films, and the reaction products formed at the ice film surfaces are examined for ionic (both positive and negative) species as well as neutral molecules for the temperature range of 95−135 K and Na coverage below the multilayer regime. The hydrolysis reaction produces isolated sodium and hydroxide ions as well as a sodium hydroxide molecule. Efficient solvation of these products by water molecules at high temperature alters their distribution near the ice film surface. Hydroxide ions tend to reside at the film surface, whereas sodium ions migrate to the film interior. NaOD molecules are efficiently solvated by water molecules at high temperature, but a substantial portion of the molecules remains undissociated.