Photoemission microspectroscopy of occupied and unoccupied surface states of crystalline facets formed on polycrystalline copper

Toshiaki Munakata, Takeharu Sugiyama, Takuya Masuda, Nobuo Ueno

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Microbeam photoemission spectroscopy of 30-meV energy resolution and 0.3-μm lateral resolution has been applied to observe (111) surface domains formed on a polycrystalline copper plate. The light source was fs-coherent radiation at a wavelength of 140 nm (8.9 eV). The images based on the intensity of the Shockley-surface-state feature clearly show many crystalline domains, exposing the (111) surface. The energy of the surface-state feature was distributed in the range from -−0.3 to −0.1 eV with respect to the Fermi level (EF). In addition to the μm-scale information, the high-energy-resolution spectroscopy provides detailed insight on the nm-scale surface morphology. Surface images based on the unoccupied image-potential state were also measured by employing two-photon photoemission with uv light at a wavelength of 280 nm (4.43 eV). The image state was always at 4.10 eV, which is very close to the state of single-crystalline Cu(111). The Shockley state was observed even on poorly crystallized areas, while the image-potential state was observed only on areas where mean (111) terrace lengths are sufficiently long.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number16
DOIs
Publication statusPublished - Oct 14 2003
Externally publishedYes

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Surface states
Photoemission
Copper
flat surfaces
photoelectric emission
Crystalline materials
copper
Wavelength
Photoelectron spectroscopy
Fermi level
Surface morphology
Light sources
Photons
Spectroscopy
Radiation
microbeams
coherent radiation
wavelengths
spectroscopy
energy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Photoemission microspectroscopy of occupied and unoccupied surface states of crystalline facets formed on polycrystalline copper. / Munakata, Toshiaki; Sugiyama, Takeharu; Masuda, Takuya; Ueno, Nobuo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 68, No. 16, 14.10.2003.

Research output: Contribution to journalArticle

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