IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Thursday Sessions
       Session SS3-ThP

Paper SS3-ThP1
Thermal Behavior of NO on Stepped Pd(112)

Thursday, November 1, 2001, 5:30 pm, Room 134/135

Session: Surface Reactions Poster Session
Presenter: K. Irokawa, Science University of Tokyo, Japan
Authors: K. Irokawa, Science University of Tokyo, Japan
S. Ito, Science University of Tokyo, Japan
K. Okada, Science University of Tokyo, Japan
T. Okuya, Science University of Tokyo, Japan
H. Miki, Science University of Tokyo, Japan
Correspondent: Click to Email
The thermal behavior of NO on a stepped Pd(112) surface has been investigated by ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy(XPS) and Auger electron spectroscopy(AES). Ramsier et al. reported that at low coverage NO adsorbed molecularly at terrace sites on Pd(112) with the NO axis perpendicular to the terrace and as increasing the coverage NO adsorbed at step sites with the NO tilted to downstairs.@footnote 1@ It was found that four peaks appeared at 2.7, 9.4, 11.2 and 14.8eV below the Fermi level in a UPS spectrum, when the surface was saturated with NO at 300K.@footnote 2@ The peak appeared at 11.2eV originates from 1@pi@+5@sigma@ orbital of NO molecules adsorbed at the step sites of Pd(112) and the three remaining peaks originate from 2@pi@, 1@pi@+5@sigma@ and 4@sigma@ orbitals of NO molecules adsorbed at the terrace sites. The peak at 11.2eV vanished at 383K with increasing temperature, although the remaining peaks disappeared at 423K. This result indicates that an activity of NO dissociation at the step edge of the Pd(112) surface is much higher than the terrace. The N atoms desorbed from the surface at 700K. This behavior observed by UPS is consistent with results of XPS and AES. @FootnoteText@ @footnote 1@ R.D.Ramsier, K.-W.Lee and J.T.Yates,Jr., Surf. Sci. 322 (1995) 244. @footnote 2@ K.Irokawa, S.Ito, T.Kioka, H.Miki, Surf. Sci 433-435 (1999) 297.