Layer-by-Layer Growth of Thin Amorphous Solid Water Films on Pt(111) and Pd(111)

Journal Article · Fri Jul 28 04:00:00 EDT 2006 · Journal of Chemical Physics, 125(4):044713-1 - 044713-12

DOI:https://doi.org/10.1063/1.2218844· OSTI ID:891132

Kimmel, Greg A; Petrik, Nikolay G; Dohnalek, Zdenek; Kay, Bruce D

The growth of amorphous solid water (ASW) films on Pt(111) is investigated using rare gas (e.g. Kr) physisorption. Temperature programmed desorption of Kr is sensitive to the structure of thin water films and can be used to assess the growth modes of these films. At all temperatures that are experimentally accessible (20 – 155 K), the first layer of water wets Pt(111). Over a wide temperature range (20 – 120 K), ASW films wet the substrate and grow approximately layer-by-layer for at least the first 3 layers. In contrast to the ASW films, crystalline ice films do not wet the water monolayer on Pt(111). Virtually identical results were obtained on epitaxial Pd(111) films grown on Pt(111). The desorption rates of thin ASW and crystalline ice films suggest that the relative free energies of the films are responsible for the different growth modes. However at low temperatures, surface relaxation or “transient mobility” is primarily responsible for the relative smoothness of the films.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 891132
• Report Number(s): PNNL-SA-48867; 6495; 6500; KC0301020
• Journal Information: Journal of Chemical Physics, 125(4):044713-1 - 044713-12, Journal Name: Journal of Chemical Physics, 125(4):044713-1 - 044713-12
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AMORPHOUS STATE
DEPOSITION
Environmental Molecular Sciences Laboratory
ICE
PALLADIUM
PLATINUM
SUBSTRATES