Microscopic ultraviolet photoelectron spectroscopy using He-I and He-II resonance lines

Yuzi Kondo, Takeo Ejima, Hirofumi Takatsuka, Makoto Watanabe

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


A microscopic ultraviolet photoelectron spectrometer (micro-UPS) is developed using a Schwarzschild objective coated with the two-color multilayer which reflects efficiently both He-I (21.2 eV) and He-II (40.8 eV) resonance lines. The spot size by the use of a pinhole of 300 μm diameter is 5 μm, which was measured using the visible light from a Xe lamp. In the present micro-UPS, a pinhole of 2 mm diameter is used to gain sufficient photon intensity, so that the spot size is 25 μm. The valence band spectra of a NiWO4 microcrystal, which cannot be grown in sufficient size, were measured by the present micro-UPS. The origin of atomic orbitals constituting the valence band of NiWO4 was elucidated.

Original languageEnglish
Pages (from-to)521-527
Number of pages7
JournalSurface Review and Letters
Issue number1
Publication statusPublished - 2002 Feb

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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