The interaction between H and CO coadsorbed on Ni{110}

CO adsorption on Ni{110} and on hydrogen precovered Ni{110} surfaces at 180 K has been studied by FT‐RAIRS. On a clean Ni{110} surface CO adsorbs at on‐top sites upto a coverage of 0.7 ML. At higher coverages the on‐top CO band at 2060 cm−1 decreases in intensity with a concomitant increase in a band at 1960 cm−1 which shifts up in frequency. The (2×1)p2mg structure at 1.0 ML CO coverage shows a single band at 1998 cm−1 attributed to CO tilted at bridged sites. FT‐RAIRS of CO adsorption on H precovered Ni{110} surfaces shows complex CO site switching within different CO and H coverage regimes. A model is presented involving compression of H into islands of high coverage and both mixed H and CO and unmixed CO islands are formed. CO adsorbs in the unmixed CO islands the same as that on clean Ni{110}. Within the mixed H/CO islands the first layer nickel atoms reconstruct and a new hydrogen desorption state is observed. The CO site switching observed by FT‐RAIRS within the various H and CO coverage regimes is...

[1]  L. Westerlund,et al.  Adsorption of CO on the Pd (100) p ( 1 × 1 ) H surface at low temperatures: altered CO coordination , 1991 .

[2]  D. King,et al.  A new ultrahigh vacuum single crystal sample transfer system with direct temperature control and measurement , 1991 .

[3]  S. Desai,et al.  The kinetics of CO desorption from Ni(110) , 1990 .

[4]  R. Hoffmann,et al.  Coadsorption of carbon monoxide and hydrogen on the Ni(100) surface. A theoretical investigation of site preferences and surface bonding , 1990 .

[5]  H. Ibach,et al.  Structure and adsorbate-adsorbate interactions of the compressed Ni(110)-(2 × 1)CO structure , 1990 .

[6]  D. King,et al.  Temperature effects in compression structures: carbon monoxide on Pd(110) by rairs , 1989 .

[7]  H. Ibach,et al.  Hydrogen adsorption and the adsorbate-induced Ni(110) reconstruction- an EELS study , 1989 .

[8]  S. Andersson,et al.  Adsorption of hydrogen on a stepped nickel surface , 1988 .

[9]  M. Passler,et al.  Structural determination of Ni(110)-(2 × 1)2CO by LEED: Differentiation of substrate-C and C-O tilt angles , 1988 .

[10]  D. Harrington,et al.  Activated adsorption of deuterium on Ni(110): evidence for a high temperature desorption state , 1988 .

[11]  H. Bonzel.  Alkali-metal-affected adsorption of molecules on metal surfaces , 1988 .

[12]  T. Germer,et al.  Coadsorption-induced site changes: Bridging hydrogen from CO and H on Rh(100) , 1988 .

[13]  L. Jönsson,et al.  Hydrogen recombination and Σ-desorption from the Ni(100)HCO coadsorption system , 1988 .

[14]  J. Küppers,et al.  Vibrational spectroscopy of CO at Ni(110): Adsorption energy at adsorption sites , 1987 .

[15]  L. Jönsson,et al.  Formation of chemisorbed H2 in the Ni(100)-H-CO coadsorption system , 1987 .

[16]  J. Küppers,et al.  Coadsorption of hydrogen and CO at Ni(110) surfaces , 1987 .

[17]  Theodore E. Madey,et al.  Vibrational spectroscopy of molecules on surfaces , 1987 .

[18]  H. Freund,et al.  Electronic and geometric structure of CO on Ni(110): Experiment and theory , 1986 .

[19]  Davenport,et al.  Chemisorption of H on magnetic Ni(001). , 1985, Physical review letters.

[20]  G. Ertl,et al.  Surface reconstruction and surface explosion phenomena in the nickel (110)/hydrogen system , 1985 .

[21]  E. Plummer,et al.  The vibrational modes of hydrogen adsorbed on Ni(110) , 1985 .

[22]  D. King,et al.  Vibrational studies of the surface phases of CO on Pt{110} at 300 K , 1984 .

[23]  J. Gland,et al.  Vibrational characterization of carbon monoxide adsorption on sulfur modified Ni(100) surfaces , 1984 .

[24]  G. Ertl,et al.  Ordered low-temperature phases in the H/Ni(110) system , 1984 .

[25]  J. White,et al.  Temperature induced structural changes for coadsorbed H and CO on Ni(100) , 1983 .

[26]  J. Muscat.  Pair interaction energies for H adsorbed on Fe(110) , 1982 .

[27]  N. Sheppard,et al.  The chemisorption of carbon monoxide on Ni(110) studied by electron energy loss spectroscopy , 1982 .

[28]  M. Nishijima,et al.  High-resolution electron energy-loss spectroscopy of CO on an Ni(110) surface☆ , 1981 .

[29]  B. Tardy,et al.  Vibrational EELS studies of CO chemisorption on clean and carbided (111), (100) and (110) nickel surfaces , 1981 .

[30]  W. H. Weinberg,et al.  The CO-adsorption of hydrogen and carbon monoxide on the (110) surface of iridium , 1980 .

[31]  J. Benziger,et al.  The effects of carbon, oxygen, sulfur and potassium adlayers on CO and H2 adsorption on Fe(100) , 1980 .

[32]  W. H. Weinberg,et al.  Segregation of co‐adsorbed species: Hydrogen and carbon monoxide on the (111) surface of rhodium , 1980 .

[33]  A. Bradshaw,et al.  The frequencies and amplitudes of CO vibrations at a metal surface from model cluster calculations , 1979 .

[34]  H. Ibach.  Comparison of cross sections in high resolution electron energy loss spectroscopy and infrared reflection spectroscopy , 1977 .

[35]  C. Melius.  On the role of d electrons in chemisorption and catalysis on transition metal surfaces , 1976 .

[36]  G. Blyholder.  CNDO MO calculations for hydrogen atom adsorption on nickel atom clusters , 1975 .

[37]  R. M. Lambert.  On the interpretation of LEED patterns due to CO adsorption on the (110) faces of Ni, Pd, Pt and Ir , 1975 .

[38]  G. Ertl,et al.  Adsorption of hydrogen on nickel single crystal surfaces , 1974 .

[39]  T. B. Grimley,et al.  Interactions between adatoms on metals and their effects on the heat of adsorption at low surface coverage , 1969 .

[40]  R. M. Hammaker,et al.  INFRARED STUDY OF INTERMOLECULAR INTERACTIONS FOR CARBON MONOXIDE CHEMISORBED ON PLATINUM , 1965 .