期刊
SURFACE SCIENCE
卷 454, 期 -, 页码 101-105出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0039-6028(00)00266-1
关键词
chemisorption; electron energy loss spectroscopy (EELS); electron stimulated desorption (ESD); nitrogen oxides; platinum; scanning tunneling microscopy; surface structure, morphology, roughness, and topography; vibrations of adsorbed molecules
The structure of nitric oxide (NO) on a Pt(111) surface was studied by scanning tunneling microscopy (STM) and high-resolution electron energy-loss spectroscopy (HREELS). The coexistence of two species is observed by STM after saturating the surface with NO at 70 K and annealing to 215 K. Two pairs of N-O and Pt-N stretching vibrational frequencies are observed in HREELS spectra after annealing, which are assigned to the two species observed by STM, Comparison between the spectra of HREELS and infrared absorption spectroscopy (IRAS) indicates that IRAS is less sensitive to the lower-frequency mode. A new model for the adsorption structure of NO on the Pt(111) surface is proposed and discussed, (C) 2000 Published by Elsevier Science B.V. All rights reserved.
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