CO on Ni(100): observation of a high-frequency IR band at 2200 cm −1

• Published in: Surface science Vol. 355; no. 1; pp. L331 - L334
• Main Authors: Grossmann, A., Erley, W., Ibach, H.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.06.1996; Amsterdam Elsevier Science; New York, NY
• Subjects: Applied sciences; Auger electron spectroscopy; Carbon monixde; Chemisorption; Condensed matter: structure, mechanical and thermal properties; Dynamics; vibrations; Exact sciences and technology; Infared absorption spectroscopy; Low index single crystal surfaces; Metals. Metallurgy; Nickel; Physical adsorption; Physics; Solid-fluid interfaces; Surface and interface dynamics and vibrations; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Chemisorption; Low index single crystal surfaces; Carbon monixde; Auger electron spectroscopy; Nickel; Infared absorption spectroscopy; Physical adsorption; Inorganic adsorbate; Adsorption; Transition elements; Metallic adsorbent; Stark effect; Carbon monoxide; Infrared spectra; Experimental study; Vibrational mode; AES
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(96)00513-4

The infrared spectrum of CO adsorbed on Ni(100) displays an additional high-frequency band at about 2200 cm −1 co-existing with the IR bands due to terminal and bridging CO at temperatures below 130 K. The 2200 cm −1 band is attributed to the internal stretching mode of CO molecules weakly bonded to those Ni surface atoms which are charged due to bonding to subsurface oxygen. The considerable blue-shift of 70 cm −1 with respect to the vibration frequency of free CO is assumed to arise from a Stark effect.