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Issue 27, 2012
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Dispersions of image potential states on surfaces of clean graphite and lead phthalocyanine film

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Abstract

Dispersions of image potential states on a graphite surface (denoted IPS1) and on 1 monolayer (ML) film (denoted IPS2) of lead phthalocyanine (PbPc) are investigated by the micro-spot angle-resolved two-photon photoemission (micro-AR-2PPE) spectroscopy. On the graphite surface, whole dispersions of the two members of IPS1 (n = 1 and 2) are observed. The n = 1 IPS1 peak is weakly visible at energy higher than the vacuum level. The effective mass of an electron in the n = 1 IPS1 becomes slightly light at the high momentum region, suggesting the interaction between the IPS1 and the unoccupied σ-band of graphite. On the PbPc film, the IPS2 band forms a band gap and back-folds at the boundary of the Brillouin zone. A 1-dimensional Kronig–Penny model is used to reproduce the effective mass and the shift of binding energy.

Graphical abstract: Dispersions of image potential states on surfaces of clean graphite and lead phthalocyanine film

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Publication details

The article was received on 23 Mar 2012, accepted on 02 May 2012 and first published on 02 May 2012


Article type: Paper
DOI: 10.1039/C2CP40922D
Citation: Phys. Chem. Chem. Phys., 2012,14, 9601-9605
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    Dispersions of image potential states on surfaces of clean graphite and lead phthalocyanine film

    R. Yamamoto, T. Yamada, M. Taguchi, K. Miyakubo, H. S. Kato and T. Munakata, Phys. Chem. Chem. Phys., 2012, 14, 9601
    DOI: 10.1039/C2CP40922D

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