The electronic structure of the CoCl_4~(2-) ion analyzed by means of visible spectroscopy, X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS)

摘要

Further measurements on single crystals of Cs_2CoCl_3 and Cs_3CoCl_5 to enlarge the knowledge of the electronic structure of the CoCl_4~(2-) ion are presented. In the visible region, the spectra show better definition of the spin-forbidden band distribution arising from the two Ti quartet terms ~4F and ~4P. Besides, measurements with X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS) allow one to (a) trace (in XPS) the density-of-states (DOS) of the valence orbitals and measure the first interband transitions as satellites near the main Co2p~(3/2) peak; and (b) identify other interband transitions and several plasmons in EELS.