Resonant photoemission and Ta 5p core reflectance spectra of 1T- and 2H-TaSe 2

Abstract

Reflectance spectra of 2H- and 1T-TaSe 2 have been measured at room temperature in the region between 20 and 60 eV. The multiplet structures in the Ta 5p core excitation region are analyzed on the localized excitation model. The ultraviolet photoemission spectra have revealed a resonant enhancement of the Ta 5d and Se 4p valence bands for the excitation of the Ta 5p core states. The difference of the multiplet structures as well as of the resonant behavior between 1T- and 2H-polytypes has elucidated the hybridization of the Se 4p states with the Ta 5d states in the valence bands of TaSe 2.