Unusual state of adsorbed CO: CO(√3 × √3 )R30°/<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cr</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math>(111)

C. Xu; B. Dillmann; H. Kuhlenbeck; H.-J. Freund

doi:10.1103/PhysRevLett.67.3551

Unusual state of adsorbed CO: CO(√3 × √3 )R30°/ ${Cr}_{2}$ $O_{3}$ (111)

C. Xu, B. Dillmann, H. Kuhlenbeck, and H.-J. Freund

Phys. Rev. Lett. 67, 3551 – Published 16 December 1991

Abstract

A new form of CO is found for adsorption on an oxide surface, where an ordered array of CO is found by angle-resolved photoemission to be bound in a tilted or lying-down mode. This new bonding configuration has very strange features which are discussed, including strange ordering of valence bands and abnormal binding energies. A simple model is presented.