Abstract
Low-energy electron-stimulated desorption (ESD) of D+ from D2O has been used to examine the phase and growth behavior of nanoscale vapor-deposited ice films grown on Pt(111) between 90-155 K. The D+ yield from porous amorphous solid water (deposited at 90 K) shows evidence for sintering near 120 K, increases between 120 and 140 K, and then drops at the amorphous-crystalline phase transition near 155 K. Ice deposited at 155 K forms an epitaxial crystalline film, with a D+ yield nearly one-third larger than the yield from crystalline films prepared by annealing the amorphous phase. This suggests that the film formed by annealing may have a different crystalline ordering or morphology than the epitaxial film deposited between 150 and 155 K. Ice deposited at 90 K on top of the epitaxial film is amorphous, but it crystallizes to a form similar to that of the underlying crystalline ice substrate. This suggests that, in this case, the buried two-dimensional interface nucleates the crystallization.
| Original language | English |
|---|---|
| Pages (from-to) | 97-101 |
| Number of pages | 5 |
| Journal | Surface Science |
| Volume | 451 |
| Issue number | 1 |
| DOIs | |
| State | Published - Apr 20 2000 |
| Event | DIET-8: 8th International Workshop on Desorption Induced by Electronic Transitions - Long Beach, NJ, USA Duration: Sep 27 1999 → Oct 1 1999 |
Funding
This work is supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, and by Associated Western Universities, Inc., under Grant no. DE-FG07-93ER-75912 or DE-FG07-94ID-13228. It was performed at the W.R. Wiley, Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Dept. of Energy's Office of Biological and Environemntal Research and located at Pacific Northwest National laboratory. Pacific Northwest National Laboratory is operated for the US Department of Energy by Battelle Memorial Institute under Contract no. DE-AC06-76RLO 1830.