TY - JOUR
T1 - Scanning tunneling microscopy study of water molecules on Pd(110) at cryogenic temperature
AU - Komeda, Tadahiro
AU - Fukidome, Hirokazu
AU - Kim, Yousoo
AU - Kawai, Maki
AU - Sainoo, Yasuyuki
AU - Shigekawa, Hidemi
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2002/7
Y1 - 2002/7
N2 - 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.
AB - 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.
KW - Adsorption geometry
KW - Gas adsorption
KW - Pd(110)
KW - Scanning tunneling microscopy (STM)
KW - Water
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U2 - 10.1143/jjap.41.4932
DO - 10.1143/jjap.41.4932
M3 - Article
AN - SCOPUS:0036658514
VL - 41
SP - 4932
EP - 4935
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 7 B
ER -