Abstract
High-resolution electron energy-loss spectroscopy (HREELS) has been applied to CN overlayers created by the dissociation of C2N2 on Ni(110). For the well-ordered overlayer formed at room temperature, the lowest CN stretch frequency (190 meV) so far reported is observed, along with distinct frustrated translation and rotation modes. The CN is concluded to be lying in the grooves of the surface with both vertical and lateral π-bonding. When condensed cyanogen is warmed to room temperature, a denser, disordered CN overlayer is formed. HREELS indicates that in addition to the flat-lying in-groove species, CN is adsorbed on the Ni ridges in both carbon- and nitrogen-bound vertical configurations, as evidenced by a band of very high CN stretch frequencies (245–270 meV) and their associated metal-molecule modes.
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