Study of unoccupied spin and electronic structure for solid surface

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We investigated the electronic states of novel materials such as high Tc superconductors and topological insulators. To realize high stability of excitation photon energy, we tried to make clear relationship between the energy resolution and environmental parameters, atmosphere temperature and heat load of optical elements in the beamline. Next we investigated electron emission form photocathode and electron transport optics to develop higher energy resolution inverse photoemission spectrometer. Thermal electron source has large energy broadening depend on temperature intrinsically. The energy spread is decreased using electron energy analyzer, but its is limited by the space charge effect especially for low pass energy. Next we study about low temperature photocathode and electron transfer optics. Boersch effect of electron beam inside the electron optics determine the upper limit of energy resolution .