Abstract
Performance of our micro-spot photoemission spectrometer based on fs-laser radiation has been applied to observe (a) surface images due to an unoccupied electronic state and (b) inhomogeneous electronic structure of a thin organic film. Two-photon photoemission spectroscopy was performed with lateral resolution of 0.6 μm for a polycrystalline copper plate. We have observed lateral distribution of the unoccupied image-potential state of Cu(1 1 1) surface. In addition to μm-scale information from the surface image, the high-energy resolution spectroscopy provides insight on the step size of nm-scale. By employment of focused VUV light of 8.86 eV, one-photon photoemission spectroscopy was performed for a copper phthalocyanine film grown on the polycrystalline copper plate with a lateral resolution of 0.3 μm and an energy resolution of 30 meV. The photoemission band due to the highest occupied molecular orbital peaked at the binding energy of either 1.6 or 1.2 eV depending on the sample positions. Polarization dependence of the band showed that molecules are poorly oriented even on the (1 1 1) surface. The results demonstrate that a large inhomogeneity exists in the interface electronic structure.
| Original language | English |
|---|---|
| Pages (from-to) | 38-42 |
| Number of pages | 5 |
| Journal | Surface Science |
| Volume | 593 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - Nov 20 2005 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
Cite this
Laser-based photoemission micro-spectroscopy for occupied and unoccupied states of inhomogeneous surfaces. / Munakata, T.; Sugiyama, T.; Sonoda, Y.
In: Surface Science, Vol. 593, No. 1-3, 20.11.2005, p. 38-42.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Laser-based photoemission micro-spectroscopy for occupied and unoccupied states of inhomogeneous surfaces
AU - Munakata, T.
AU - Sugiyama, T.
AU - Sonoda, Y.
PY - 2005/11/20
Y1 - 2005/11/20
N2 - Performance of our micro-spot photoemission spectrometer based on fs-laser radiation has been applied to observe (a) surface images due to an unoccupied electronic state and (b) inhomogeneous electronic structure of a thin organic film. Two-photon photoemission spectroscopy was performed with lateral resolution of 0.6 μm for a polycrystalline copper plate. We have observed lateral distribution of the unoccupied image-potential state of Cu(1 1 1) surface. In addition to μm-scale information from the surface image, the high-energy resolution spectroscopy provides insight on the step size of nm-scale. By employment of focused VUV light of 8.86 eV, one-photon photoemission spectroscopy was performed for a copper phthalocyanine film grown on the polycrystalline copper plate with a lateral resolution of 0.3 μm and an energy resolution of 30 meV. The photoemission band due to the highest occupied molecular orbital peaked at the binding energy of either 1.6 or 1.2 eV depending on the sample positions. Polarization dependence of the band showed that molecules are poorly oriented even on the (1 1 1) surface. The results demonstrate that a large inhomogeneity exists in the interface electronic structure.
AB - Performance of our micro-spot photoemission spectrometer based on fs-laser radiation has been applied to observe (a) surface images due to an unoccupied electronic state and (b) inhomogeneous electronic structure of a thin organic film. Two-photon photoemission spectroscopy was performed with lateral resolution of 0.6 μm for a polycrystalline copper plate. We have observed lateral distribution of the unoccupied image-potential state of Cu(1 1 1) surface. In addition to μm-scale information from the surface image, the high-energy resolution spectroscopy provides insight on the step size of nm-scale. By employment of focused VUV light of 8.86 eV, one-photon photoemission spectroscopy was performed for a copper phthalocyanine film grown on the polycrystalline copper plate with a lateral resolution of 0.3 μm and an energy resolution of 30 meV. The photoemission band due to the highest occupied molecular orbital peaked at the binding energy of either 1.6 or 1.2 eV depending on the sample positions. Polarization dependence of the band showed that molecules are poorly oriented even on the (1 1 1) surface. The results demonstrate that a large inhomogeneity exists in the interface electronic structure.
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UR - http://www.scopus.com/inward/citedby.url?scp=26444441495&partnerID=8YFLogxK
U2 - 10.1016/j.susc.2005.06.043
DO - 10.1016/j.susc.2005.06.043
M3 - Article
AN - SCOPUS:26444441495
VL - 593
SP - 38
EP - 42
JO - Surface Science
JF - Surface Science
SN - 0039-6028
IS - 1-3
ER -