This paper provides a basic introduction to the principles and instrumentation of ultraviolet photoelectron spectroscopy (UPS), ultraviolet photoelectron yield spectroscopy (PYS), and constant final state- yield spectroscopy (CFS-YS) measurements. It’s performed different measurements of HOPG and compared the results, deciding a series of electronic energy level parameters such as work functionΦ= 4.56 eV, valance band energy EVBM= 0.87 eV, and ionization energy Ith= 5.35 eV. It offers an initial understanding of the surface electronic structure via ultraviolet photoelectron spectroscopy method. It’s also demonstrated that ultraviolet photoelectron spectroscopy is an effective method for characterizing the electronic structure of materials.
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