CNR, Ist Struttura Mat, Trieste, Italy
; Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
; Chinese Acad Sci, Beijing Synchrotron Radiat Facil, Inst High Energy Phys, Beijing 100039, Peoples R China
; Univ Autonoma Madrid, Madrid, Spain
; CNR, IMAI, Trieste, Italy
; INFM, TASC, Trieste, Italy
The high-energy resolution O K-edge absorption near-edge x-ray absorption fine structure spectrum has been measured for in situ prepared potassium superoxide. The experimental data have been analyzed in detail by multiple scattering calculations using self-consistent field potentials. In particular, the so-called pi resonance at the rising edge, which presents a double-peak structure, has been totally resolved and reproduced by the calculations. This analysis indicates that the grown material is arranged in a KO2 structure with an O-O distance between 1.31 and 1.34 Angstrom. Moreover, the calculation demonstrates both a complete ionic character of the bound between the O2- anion and K atoms and a strong interaction between the anion and solid-state matrices.
Pedio, M,Wu ZY,Wu, ZY,et al. NEXAFS experiment and multiple scattering calculations on KO2: Effects on the pi resonance in the solid phase[J]. PHYSICAL REVIEW B,2002,66(14):144109.
Pedio, M.,吴自玉.,Wu, ZY.,Benfatto, M.,Mascaraque, A.,...&Comicioli, C.(2002).NEXAFS experiment and multiple scattering calculations on KO2: Effects on the pi resonance in the solid phase.PHYSICAL REVIEW B,66(14),144109.
Pedio, M,et al."NEXAFS experiment and multiple scattering calculations on KO2: Effects on the pi resonance in the solid phase".PHYSICAL REVIEW B 66.14(2002):144109.