AVS 45th International Symposium
    Surface Science Division Monday Sessions
       Session SS-MoP

Paper SS-MoP6
LEED and STM Measurement of NO/Pt(111) at Low Temperature

Monday, November 2, 1998, 5:30 pm, Room Hall A

Session: Surface Science Division Poster Session
Presenter: M. Matsumoto, Institute of Molecular Science, Japan
Authors: M. Matsumoto, Institute of Molecular Science, Japan
T. Yamada, University of Tsukuba, and CREST, Japan
N. Tatsumi, University of Tokyo, Japan
T. Itoyama, University of Tokyo, Japan
K. Miyake, University of Tsukuba, and CREST, Japan
K. Hata, University of Tsukuba, and CREST, Japan
H. Shigekawa, University of Tsukuba, and CREST, Japan
K. Fukutani, University of Tokyo, Japan
T. Okano, University of Tokyo, Japan
Correspondent: Click to Email
The chemisorption of nitric oxide on Pt(111) at low temperature has been studied by electron energy loss spectroscopy (EELS), infrared absorption spectroscopy (IRAS) and low energy electron diffraction(LEED). The vibrational spectroscopy showed that N-O stretching frequency is 1490 cm@super-1@ at low coverage(<0.5L ) and 1710 cm@super-1@ at high coverage(>0.5L).@footnote 1@ At high coverage, 2X2 LEED pattern was observed and its structure was attributed to the fcc hollow site by LEED dynamic theory.@footnote 2@ But there is no reasonable account for the difference of the N-O stretching frequency between low and high coverage regions and the structure is controversial yet. We measured the LEED I-V curves and STM images of NO/Pt(111) surface at several temperature and coverage conditions . At 175K, diffuse 2X2 LEED pattern could be seen even at low dosage(0.05L) and the I-V curve was the same as that at high dosage(1L). This indicates that (2X2)-NO islands grow with coverage increase but the local structure does not change at this temperature region. @FootnoteText@ @footnote 1@M.-B.Song, M.Suguri, K.Fukutani, F.Komori, and Y.Murata : Appl.Surf.Sci. 79/80 (1994) 25. @footnote 2@N.Materer, A.Barbieri, D.Gardin, J.D.Batteas, M.A.VanHove, and G.A.Somorjai: Surf.Sci. 303 (1994) 319.