Angle- and time-resolved two-photon photoemission spectroscopy for unoccupied levels of lead phthalocyanine film

Masahiro Shibuta, Keisuke Miyakubo, Takashi Yamada, Toshiaki Munakata

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We have measured angle- and time-resolved two-photon photoemission (2PPE) from unoccupied levels of graphite (HOPG) and lead phthalocyanine (PbPc) films. Our angle-resolved 2PPE microspot spectroscopy with a lateral resolution of 0.4 μm can effectively select flat and homogeneous regions of the film, allowing measurements of the dispersion of the image potential state (IPS) on the PbPc film. The effective mass of the IPS on the film is 2.2 ± 0.2, which is heavier than that for the bare HOPG, 1.2 ± 0.1. The lifetimes of the states at 30 K are 30 fs for both the HOPG and the PbPc film. These results suggest a hybridization of the IPS with a molecule-derived unoccupied level. The lifetimes of the lowest unoccupied molecular level (LUMO)-derived levels are about 80 fs. A possible decay process to lower states is suggested.

Original languageEnglish
Pages (from-to)19269-19273
Number of pages5
JournalJournal of Physical Chemistry C
Volume115
Issue number39
DOIs
Publication statusPublished - 2011 Oct 6
Externally publishedYes

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Photoelectron spectroscopy
photoelectric emission
Photons
Lead
photons
spectroscopy
life (durability)
Graphite
Photoemission
graphite
Lead phthalocyanine
Spectroscopy
Molecules
decay
molecules

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Angle- and time-resolved two-photon photoemission spectroscopy for unoccupied levels of lead phthalocyanine film. / Shibuta, Masahiro; Miyakubo, Keisuke; Yamada, Takashi; Munakata, Toshiaki.

In: Journal of Physical Chemistry C, Vol. 115, No. 39, 06.10.2011, p. 19269-19273.

Research output: Contribution to journalArticle

Shibuta, Masahiro ; Miyakubo, Keisuke ; Yamada, Takashi ; Munakata, Toshiaki. / Angle- and time-resolved two-photon photoemission spectroscopy for unoccupied levels of lead phthalocyanine film. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 39. pp. 19269-19273.
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