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http://dx.doi.org/10.4283/JKMS.2006.16.1.092

Quantitative Structure Determination of Ni(111)(2×2)-O/CO: temperature Dependent Study  

Kang J.H. (Department of Electro and Nano Physics, Kookmin University)
Publication Information
Journal of the Korean Magnetics Society / v.16, no.1, 2006 , pp. 92-97 More about this Journal
Abstract
A study of the adsorption site of CO in the Ni(111)$(2\times2)$-O/CO coadsorbed phase over different sample preparation temperatures revealed that the atop site is favoured. The Ni-C spacing is given by $1.77\pm0.01\;{\AA}$. A study of the adsorption site of Co in the Ni(111)$(2\times2)$-O/CO coadsorbed phase over different sample preparation temperatures revealed that the atop site is favoured. The Ni-C spacing is given by $1.77\pm0.01\;{\AA}$. The data from the sample prepared at 265 K showed atop sites, which is well consistent with vibrational spectroscopy, whilst the data from the low temperature preparation appears the mixture of atop and hop $(35\%)$. The occupation of hop hollow sites is probably due to an incorrect pre-coverage of atomic oxygen (different from 0.25ml). Similar observation of site mixture also found in recent high resolution XPS measurements using C 1s and O 1s chemical shifts.
Keywords
photoelectron diffraction; adsorption site; coadsorption;
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