Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (7): 2197.doi: 10.7503/cjcu20210130

• Article • Previous Articles     Next Articles

An In-depth Theoretical Study of Ligand Field and Charge Transfer Effects on Co2+2pL2,3-edges X-ray Absorption Spectra

CHENG Xiao1,2, BORA Debajeet K.2, GLANS Per⁃Anders2, GUO Jinghua2, LUO Yi1()   

  1. 1.Hefei National Laboratory for Physical Sciences at the Microscale,University of Science & Technology of China,Hefei 230026,China
    2.Advanced Light Source,Lawrence Berkeley National Laboratory,Berkeley CA 94720,USA
  • Received:2021-03-01 Online:2021-07-10 Published:2021-06-18
  • Contact: LUO Yi E-mail:yiluo@ustc.edu.cn

Abstract:

The 2p L2,3-edges X-ray absorption spectrum of Co2+ in octahedral(Oh) symmetric ligand field is studied theoretically via the multiplet calculation method. The octahedral symmetric crystal field and corresponding charge transfer effect between ligands and Co2+ cation have been investigated. All the parameters used in the multiplet calculation are discussed systematically in regards to their specific effect on X-ray absorption features and related mechanisms. The calculated results are compared with the L-edge X-ray absorption spectra of CoO and CoCl2, both with the same Oh symmetrical local structure of the Co2+ cation. The experimentally observed multiplet spectra features are assigned to different spin states and their intensity change is rela-ted to the crystal field strength. The underlying charge transfer effect has also been revealed. This study provides a fundamental basis for multiplet calculations of complex systems with lower symmetry associated with cobalt and other transition metals.

Key words: Multiplet calculation, X-ray absorption spectrum, Cobalt, Crystal field effect, Charge transfer effect

CLC Number: 

TrendMD: