Abstract
A synchrotron radiation study of NO chemisorption on Pd(111) was carried out at room temperature in the hv = 30–130 eV range which covers the “Cooper minimum” of Pd4d electrons. The relative enhancement in photoemission sensitivity of the NO-derived 4σ, 5σ + 1π and 2π molecular orbitals was dramatic at hv = 120–130 eV, and NO was confirmed to chemisorb in molecular form on the surface at room temperature. The bonding shifts of the 5σ and 1π orbitals were found to be smaller than 0.2 eV. The 2π level showed a significant bonding shift of 0.7–1.9 eV, suggesting that the unpaired electron in the 2π orbital is mainly responsible for the chemisorption bonding through a charge transfer mechanism; i.e., electron donation from the 2π up-spin level into the metal and simultaneous back-donation into the down-spin 2π state from the metal.
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