High resolution NEXAFS studies of aromatic molecules adsorbed and condensed on Ni(111)

High resolution near-edge X-ray absorption fine structure measurements have been performed on benzene, pyridine and pyrazine adsorbed and condensed on Ni(111). The carbon K-edge multilayer data show the splitting of the e 2u level of benzene into b 1 and a 2 levels for pyridine and into b 3u and a u...

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Bibliographic Details
Published inSurface science Vol. 244; no. 3; pp. L152 - L156
Main Authors Aminpirooz, S., Becker, L., Hillert, B., Haase, J.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.03.1991
Amsterdam Elsevier Science
New York, NY
Subjects
Applied sciences
Chemistry
Exact sciences and technology
General and physical chemistry
Metals. Metallurgy
Solid-gas interface
Surface physical chemistry
High resolution
Multilayer
Nitrogen heterocycle
Organic adsorbate
Crystal face
Transition metal
Experimental study
EXAFS spectrometry
Gas solid adsorption
Benzene
Gas solid interface
Metallic adsorbent
Benzenic compound
Nickel
Physical method
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Summary:High resolution near-edge X-ray absorption fine structure measurements have been performed on benzene, pyridine and pyrazine adsorbed and condensed on Ni(111). The carbon K-edge multilayer data show the splitting of the e 2u level of benzene into b 1 and a 2 levels for pyridine and into b 3u and a u levels for pyrazine; the corresponding π resonances are asymmetric due to the vibrational fine structure. At the nitrogen K-edge the transitions into the a 2 and a u levels are not observed. The benzene data suggest that the Rydberg orbitais are quenched in the condensed phase and that the broad structure above a photon energy of ~ 300 eV is made up of (at least) two σ resonances. On adsorption the π resonances are considerably broadened at the adsorption edges of atoms which interact strongly with the substrate.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(91)90489-F