Orientation-dependent final-state effects in photoelectron spectra of physisorbed molecules

High-resolution core- and valence-level photoemission and core-to-valence X-ray-absorption spectra of O sub 2 physisorbed on graphite are reported. The submonolayer delta - zeta 2 orientational phase transition is manifest in the core-level spectrum as an extra broadening of each component of the pa...

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Bibliographic Details
Published in:Physical review letters 1992-02, Vol.68 (7), p.982-985
Main Authors: NILSSON, A, PALMER, R. E, TILLBORG, H, HERNNÄS, B, GUEST, R. J, MARTENSON, N
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:High-resolution core- and valence-level photoemission and core-to-valence X-ray-absorption spectra of O sub 2 physisorbed on graphite are reported. The submonolayer delta - zeta 2 orientational phase transition is manifest in the core-level spectrum as an extra broadening of each component of the paramagnetically split O 1s doublet. This phase transition is not visible in the 1 Pi sub g valence spectrum of the 1s - > Pi sub g absorption line. The results reflect the detailed shape of the charge distribution in the final state of the molecule. It is suggested that the population of low-frequency librational modes makes an important contribution to the core-level linewidths.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.68.982