Abstract
Temperature-programmed time-of-flight secondary ion mass spectroscopy is utilized in investigating the interactions between the adsorbed HCl (NH 3) molecules and hydrated NH 3 (HCl) molecules at the water–ice surface in the temperature range of 15–200 K. NH 4Cl molecules or their precursors are generated above 120 K when NH 3 is adsorbed on an acidic water–ice surface prepared by the hydration of HCl molecules. The reaction occurs at temperature higher than that on a pure HCl film due to the presence of hydrating water molecules, and unreacted NH 3 and HCl molecules coexist considerably with their own hydration shells. HCl adsorbed on the basic water–ice surface formed by the hydration of NH 3 molecules results in the creation of both NH 4Cl and hydrated HCl molecules above 40 K. These results clearly indicate that the interactions between NH 3 and H 2O molecules are much weaker than those between HCl and H 2O molecules, as far as the hydration and ionization of solute molecules are concerned.
Published Version
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