@article{6d8e84c145604981bca759a4575de978,
title = "Low temperature coadsorption of hydrogen and carbon monoxide on Ni(100). II. ELS and XPS studies",
abstract = "Electron energy loss spectroscopy (ELS) and X-ray photoelectron spectroscopy (XPS) have been used to characterize CO adsorbed alone and coadsorbed with hydrogen on Ni(100) at low temperatures. Evidence is presented for a significantly weaker bond between CO and the substrate in the presence of coadsorbed hydrogen as compared to CO adsorbed alone. This is reflected by a growth of satellite intensity and a shift to higher binding energy of XPS C(1s) and O(1s) core lines when hydrogen is present. The ELS data show that the splitting between the 2πb and 2πa levels decreases when hydrogen and CO are coadsorbed.",
author = "Koel, {Bruce E.} and Peebles, {D. E.} and White, {J. M.}",
note = "Funding Information: In recent work we have studied the coadsorption of hydrogen and carbon monoxide on several single crystal surfaces \[1-4\]. A variety of adsorbate-adsorbate interactions have been found, ranging from segregated island structures on Ru(001) \[4\]t o strong local coupling of CO and H on Ni(100) \[1,2\]a nd Rh(100) \[31. In a recent paper \[1\], we reported an investigation of the coadsorption of hydrogen and CO on Ni(100) at 100 K using temperature programmed desorption (TPD), work function change (Ar and ultraviolet photoelectron spectroscopy (UPS). One conclusion of these studies was that the bonding of CO to Ni(100) was significantly weakened by preadsorbed hydrogen. As one way of gaining further insight, we investigated this same system using energy loss spectroscopy (ELS) and X-ray photoelectron spectroscopy (XPS). These two techniques provide data complementary to the UPS results \[1\]i n the sense that valence levels are probed in ELS di/'ectly and in XPS through the core-level satellite structure. However, since the final states are different, XPS {"} Supported in part by the National Science Foundation. Grant CHE80-05107. ** Proctor and Gamble Fellow of the ACS Colloid and Surface Chemistry Division. *** American Vacuum Society Scholar.",
year = "1983",
month = mar,
day = "1",
doi = "10.1016/S0039-6028(83)80057-0",
language = "English (US)",
volume = "125",
pages = "739--761",
journal = "Surface Science",
issn = "0039-6028",
publisher = "Elsevier",
number = "3",
}