Abstract
The adsorption state of nitric oxide on a W(100) surface at room temperature has been studied by means of electron stimulated desorption ion angular distribution (ESDIAD) and low energy electron diffraction (LEED). Only O + ions are detected by ESD from the NO adsorbed W(100) surface. The ESDIAD pattern from the NO-adsorbed surface has a bright center spot and 4-symmetry [100] and [110] lobes with very weak intensity. At low NO exposure (below 0.4 L), the center spot is a hazy square in shape, and becomes circular in shape with increasing exposure. The [100] and [110] lobes appear around the center spot above 0.4 L. With increasing temperature, the intensities of the center spot and the [100] lobes exhibit similar variation, and the [110] lobe intensities decrease monotonically. The surface after NO adsorption has a diffuse (4 × 1) structure, which changes to the sharp (4 × 1) structure around the temperature at which the center spot intensity decreases (∼900–1100 K), and a (2 × 1) structure appears above 1100 K. There are 4 adsorption sites for O atoms on the NO-adsorbed surface.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
