DISCLAIMERThis document was prepared _ an account of work sponsored by the United States Government. Neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or _ervice by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or The Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof or The Regents of the University of California and shall not be used for advertising or product endorsement purposes. w Lawrence Berkeley Laboratory is an equal opportunity employer.
The chemisorption of NO on a Pt(100) single crystal surface at 140 and 300 K was investigated by high resolution electron energy loss spectroscopy, combined with Auger electron spectroscopy and LEED. Chemisorption of NO was predominantly molecular. The unreconstructed Pt(100)−1×1 surface was characterized by a single NO stretch frequency at 1615 cm−1 and two low frequency vibrations at 230 and 380 cm−1. These latter modes are likely to represent the Pt–NO stretch and Pt–N–O bending vibrations, respectively. The adsorbed molecule has therefore Cs symmetry in this case and is bent with respect to the surface normal. Low coverage NO adsorption at 140 K on the reconstructed Pt(100)−5×20 surface gave rise to three frequencies at 1690, 465, and 310 cm−1. Thus NO is also adsorbed in a bent configuration on this surface. At higher coverage an additional NO stretch frequency at 1790 cm−1 indicated a second adsorption site. Low frequency modes could not be clearly resoled for this species. NO adsorption on the same surface at 300 K was characterized by frequencies at 1805, 1630, and 380 cm−1, independent of NO coverage. At this temperature the reconstruction of the surface is lifted locally where NO adsorption took place. In analogy to the 1×1 surface it was concluded that the major NO state corresponds to a bent NO molecule while the 1805 cm−1 frequency represents NO adsorbed on a defect site which is created by the structure transformation.
Spin-polarized photoemission spectra at low photon energies from ferromagnetic ultrathin Fe layers on Cu(l00) show a substantial polarization of the Cu 3d peaks. This is attributed to spin-dependent attenuation in the Fe overlayer. Values of the spin-dependent mean free path at low electron energies are obtained.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.