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Published December 15, 1994 | Published
Journal Article Open

Orientation and substrate interaction of adsorbed CO and NO molecules probed by circular dichroism in the angular distribution of photoelectrons


The sensitivity and utility of circular dichroism in the angular distribution of photoelectrons (CDAD) as a probe of molecular orientation is demonstrated for adsorbed CO and NO molecules. A comparison between measured CDAD spectra and calculated values for spatially oriented CO and NiCO clearly confirms the well-known perpendicular adsorption for CO on Ni(100), whereas for CO adsorbed on Fe(100) a tilted adsorption geometry was found. For NO/Ni(100) and for NO on the oxygen-preadsorbed Ni(100) surface, an average tilt angle of α=40±10° was observed. In the case of the oxygen-preadsorbed Ni(100) surface, a higher fraction of NO molecules was found to be in a tilted orientation than on the clean surface.

Additional Information

© 1994 American Physical Society. (Received 14 February 1994) The authors wish to thank the staff of BESSY for excellent support and gratefully acknowledge financial support by the Bundesministerium für Forschung und Technologie (BMFT 05 431 AXB 6). They also thank Dr. A. P. Kaduwela for a critical reading of the manuscript.

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Published - PhysRevB.50.17534.pdf


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August 20, 2023
August 20, 2023