Spectroscopic Evidence for Energy Loss of Photoelectrons Interacting with Image Charge(Condensed matter: structure and mechanical and thermal properties)
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概要
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We have measured the spectra of very low-energy photoelectrons emitted from the Cu single crystal surface excited by tunable laser light. The difference between the photon energy and the work function of the sample surface (i.e., the highest kinetic energy of the photoelectron) was less than 300 meV. A spike structure appeared just above the vacuum level in the photoelectron spectra of the Cu(001) surface. In contrast the spectra from the Cu(110) and Cu(111) surfaces contained no such structure. We have concluded that the spike structure in the Cu(001) spectra arises from the electron energy loss in vacuum by interaction with its image charge. Finally we propose the mechanism through which the spike structure is produced. The spike structure appears when there is no electronic state at the vacuum level (at the Γ^^- point) to which zero kinetic energy photoelectrons can return.
- 2007-04-15
著者
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ARAFUNE Ryuichi
RIKEN Photodynamics Research Center
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HAYASHI Kei
RIKEN Photodynamics Research Center
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UEDA Shigenori
RIKEN Photodynamics Research Center
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UEHARA Yoichi
RIKEN Photodynamics Research Center
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USHIODA Sukekatsu
RIKEN Photodynamics Research Center
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Ueda Shigenori
Riken Photodynamics Research Center:(present Address)national Institute For Materials Science Tsukub
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Ueda Shigenori
National Institute For Materials Science Spring-8
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Ueda Shigenori
National Institute For Materials Science (nims) Spring-8
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Uehara Yoichi
Riken Photodynamics Research Center:research Institute Of Electrical Communication Tohoku University
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Ushioda Sukekatsu
Riken Photodynamics Research Center:japan Advanced Institute Of Science And Technology
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Ushioda Sukekatsu
School Of Materials Science Japan Advanced Institute Of Science And Technology
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Ushioda Sukekatsu
Research Institute Of Electrical Communication Tohoku University:riken Photodynamics Research Center
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Ushioda Sukekatsu
Research Institute Of Electrical Communication Tohoku University
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Ushioda Sukekatsu
Research Institute Of Electrical Communication Tohoku University And Crest-japan Science And Technol
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Hayashi Kei
Riken Photodynamics Research Center:(present Address)department Of Applied Physics Graduate School O
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Arafune R
Crest Japan Science And Technology Corporation
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Arafune Ryuichi
Riken Photodynamics Research Center:(present Address)presto Japan Science And Technology Agency (jst
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