Abstract
We show scanning tunneling microscopy (STM) images of water molecules on Pd(110) at a cryogenic temperature of 4.7 K which enables the observation of isolated water molecules. We observe water-induced features in the STM images in a low-coverage region (∼ 0.02 ML), which can be classified in terms of height; namely, (A) 0.15 Å, (B) 0.3 Å and (C) 0.55 Å, observed at Vs = -100 mV. In a high-coverage region, feature C dominates and forms a local c(2 × 2) structure. Since the ordered structure is identical with the previously reported superstructure of bilayer water on Pd(110), feature C should correspond to a tetramer of water molecules, a unit of bilayer water. Feature A is located on the Pd(110) row. Since feature A is the smallest one, we consider that this corresponds to the monomer of the water molecule whose existence has been observed previously at temperatures below 10 K by electron energy loss spectroscopy (EELS) measurement.
| Original language | English |
|---|---|
| Pages (from-to) | 4932-4935 |
| Number of pages | 4 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 41 |
| Issue number | 7 B |
| DOIs | |
| Publication status | Published - 2002 Jul |
| Externally published | Yes |
Keywords
- Adsorption geometry
- Gas adsorption
- Pd(110)
- Scanning tunneling microscopy (STM)
- Water
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)