Abstract
The effect of energetic rare-gas colliders in a supersonic beam on the interaction of H2O and D2O with Ru(001) is discussed. It was found that molecules which are thermally desorbed near 180 K, the A2 state for both H2O and D2O, undergo selective collision-induced desorption (CIDE) following collisions with energetic Kr. Threshold energies for CIDE are 3.4 eV for H2O and 3.8 eV for D2O, consistent with the already known isotope effect in the temperature-programmed desorption (TPD) spectra of these molecules. Ice features which are thermally less stable than the A2 molecules, being desorbed near 160 K, are not affected by collisions at energies up to 5.0 eV. This observation indicates that kinetic energy dissipation by the hydrogen-bonded network is extremely efficient.
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