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Title: Application of high-resolution photoelectron spectroscopy: Vibrational resolved C 1s and O 1s spectra of CO adsorbed on Ni(100)

There are various effects which determine the line shape of a core-level electron spectrum. These are due to the finite life-time of the core hole, inelastic scattering of the outgoing photoelectron, electronic shake-up and shake-off processes and vibrational excitations. For free atoms and molecules the different contributions to the observed line shapes can often be well separated. For solids, surfaces and adsorbates the line shapes are in general much broader and it has in the past been assumed that no separation of the various contributions can be made. In the present report the authors will show that this is indeed not the case. Surprisingly, the vibrational fine structure of CO adsorbed on Ni(100) can be resolved in the C 1s and O 1s electron spectra. This was achieved by the combination of highly monochromatized soft X-rays from B18.0 with a high resolution Scienta 200 mm photoelectron spectrometer. X-ray photoelectron spectroscopy (XPS) with tunable excitation energy yields as a core level spectroscopy atomic and site-specific information. The presented measurements allow for a determination of internuclear distances and potential energy curves in corehole ionized adsorbed molecules. The authors analysis of the c(2x2) phase CO/Ni(100) on {open_quotes}top{close_quotes} yielded a vibrational splitting of 217more » +/- 2 meV for C 1s ionization. For O 1s ionization a splitting of 173 +/- 8 meV was found.« less
Authors:
; ;  [1]
  1. Uppsala Univ. (Sweden) [and others
Publication Date:
OSTI Identifier:
603553
Report Number(s):
LBNL--39981
ON: DE97007345; TRN: 98:009546
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1997; Related Information: Is Part Of Advanced light source: Compendium of user abstracts 1993--1996; PB: 622 p.
Research Org:
Lawrence Berkeley Lab., CA (United States)
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; CARBON MONOXIDE; ADSORPTION; NICKEL; MONOCRYSTALS; PHOTOELECTRON SPECTROSCOPY; SOFT X RADIATION; VIBRATIONAL STATES; INNER-SHELL EXCITATION