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Ultraviolet photoelectron spectra of C 82 and K x C 82

Ultraviolet photoelectron spectra of C 82 and K x C 82 Photoelectron spectra of C 82 , one of the newly isolated fullerene compounds, are measured with a synchrotron-radiation light source. The spectra resemble those of C 84 , and their spectral onset is at 1.15 eV below the Fermi level ( E F ). The first band is a broadband and consists of two peaks located at 2.2 and 3.3 eV. A slight structure is observed at the low-binding-energy side of the first band. The intensity of the two peaks of the band oscillates with the incident photon energy change, as is observed in C 60 , C 70 , and C 84 . The second band is located between 4 and 6.2 eV with a peak at 5.3 eV and an accompanying shoulder at the low-binding-energy side. The third band is located between 6.2 and 9 eV and consists of a peak at 7.8 eV and a distinct shoulder at 6.5 eV. Potassium dosing brings a new band between E F and the first band and its intensity grows as the potassium dosage increases. The spectral onset approaches E F in accordance with an increase of potassium dosage but it does not cross E F , which indicates the semiconductive nature of the potassium-dosed C 82 complex. The spectra of low or high potassium dosage can be understood by the rigid-band model, but the spectral change at medium potassium dosage seems to support a nonrigid-band filling of the electrons from the potassium atoms. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Ultraviolet photoelectron spectra of C 82 and K x C 82

Hino, Shojun; Matsumoto, Kazuo
Physical Review B , Volume 48 (11) – Sep 15, 1993
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1993 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.48.8418
Publisher site
See Article on Publisher Site

Abstract

Photoelectron spectra of C 82 , one of the newly isolated fullerene compounds, are measured with a synchrotron-radiation light source. The spectra resemble those of C 84 , and their spectral onset is at 1.15 eV below the Fermi level ( E F ). The first band is a broadband and consists of two peaks located at 2.2 and 3.3 eV. A slight structure is observed at the low-binding-energy side of the first band. The intensity of the two peaks of the band oscillates with the incident photon energy change, as is observed in C 60 , C 70 , and C 84 . The second band is located between 4 and 6.2 eV with a peak at 5.3 eV and an accompanying shoulder at the low-binding-energy side. The third band is located between 6.2 and 9 eV and consists of a peak at 7.8 eV and a distinct shoulder at 6.5 eV. Potassium dosing brings a new band between E F and the first band and its intensity grows as the potassium dosage increases. The spectral onset approaches E F in accordance with an increase of potassium dosage but it does not cross E F , which indicates the semiconductive nature of the potassium-dosed C 82 complex. The spectra of low or high potassium dosage can be understood by the rigid-band model, but the spectral change at medium potassium dosage seems to support a nonrigid-band filling of the electrons from the potassium atoms.

Journal

Physical Review B – American Physical Society (APS)

Published: Sep 15, 1993

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