Probing low-temperature water ice phases using electron-stimulated desorption
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 120-140 K, and then drops at the amorphous-crystalline phase transition near 155 K. Ice deposited at 155 K forms at 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 150-155 K. Ice deposited at 90 K on-top of the expitaxial film is amorphous but 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.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1024585
- Report Number(s):
- PNNL-SA-32103; SUSCAS; KC0301020; TRN: US201119%%478
- Journal Information:
- Surface Science, 451(1-3):97-101, Vol. 451, Issue 1-3; ISSN 0039-6028
- Country of Publication:
- United States
- Language:
- English
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