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Unoccupied dimer-bond state at Si(001) surfaces

机译:Si(001)表面的空二聚键状态

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摘要

Two-photon photoemission is used to identify the unoccupied dimer-bond state on the Si(001) surface at an energy 2.83 eV above the valence-band maximum. A strong resonance enhancement is found for excitation from the occupied dangling-bond state. The azimuthal and polarization dependence proves the orientation of the observed state along the dimer axis. The dispersion is dominated by the occupied initial state described by -0.50 free-electron masses in one- and two-photon photoemission.
机译:两光子光发射用于在价带最大值以上2.83 eV的能量下识别Si(001)表面上未占据的二聚键状态。发现了强烈的共振增强,以从占据的悬空键态激发。方位角和极化依赖性证明了观察到的状态沿二聚体轴的方向。在一个和两个光子的光发射中,色散以所占据的初始状态(由-0.50自由电子质量描述)为主。

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