Ultrahigh-resolution photoemission spectroscopy of superconductors using a VUV laser

T. Kiss, T. Shimojima, F. Kanetaka, K. Kanai, T. Yokoya, S. Shin, Y. Onuki, T. Togashi, C. Q. Zhang, C. T. Chen, S. Watanabe

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


We have developed an ultrahigh-resolution photoemission system using a quasi continuous wave (quasi-CW) VUV laser. The photon energy of the VUV laser is 6.994 eV. It has a line width of 260 μeV and a repetition rate of 80 MHz. The photon energy of this laser is the highest for a quasi-CW laser. Using a quasi-CW laser removes the space charge effect and hence does not degrade the energy resolution. For the electron analyser, we use the newly designed ultrahigh-resolution photoelectron analyser GAMMADATA-SCIENTA R4000. The analyser resolution is about 250 μeV with a wide collecting angle of about 38°. The total energy resolution of this system is measured to be 360 μeV for the Fermi edge of gold. Using this system, we have measured several low transition temperature superconductors and succeeded to observe the bulk superconducting state of these materials.

Original languageEnglish
Pages (from-to)953-956
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Publication statusPublished - Jun 2005
Externally publishedYes


  • Bulk electron structure
  • Quasi-CW laser
  • Superconducting gap
  • Ultrahigh-resolution photoemission spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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