Charge Transfer Mechanism and Spatial Density Correlation of Electronic States of Excited Zinc (3d⁹) Films

Li Chen, Mitsugi Hamasaki, Hirotaka Manaka, Kozo Obara

Country Graduate School of Science and Engineering, Kagoshima University, Kagoshima, Japan.

DOI: 10.4236/ojpc.2014.42007                

Abstract

In material science, half filled 3d orbital of transition metals is essentially an important factor controlling characteristics of alloys and compounds. This paper presents a result of the challenge of excitation of inner-core electron system with long lifetime of zinc films. The advanced zinc films with excited inner-core electron, 3dⁿ (n = 9, 8). We report experimental results of XPS measurements of 9 points in the sample along vertical direction, respectively. The most pronounced futures are existence of satellites, which are about 4 eV higher than the main lines. According to the charge transfer mechanism proposed by A. Kotani and K. Okada, it was clarified that the origins of these peaks are c3d⁹L for the main peak and c3d⁹ for the satellite, respectively. From the energy difference, δE_B, and peak intensity ratio, I₊/I_-, between c3d⁹ and c3d¹⁰L, the energy for charge transfer, Δ, and mixing energy, T, were estimated. In the region where the intensity of c3d¹⁰L becomes large, Δ becomes small, 1.2 < Δ< 2.7, and T becomes small, too, 0.1 < T < 0.9, respectively. In this calculation, we supposed U_dc = 5.5 eV and U_dd = 5.5 eV. In the analysis along vertical direction, intensity profile of Zn3d⁹ showed odd functional symmetry and that of Zn3d¹⁰L showed even functional symmetry. Only the intensity profile of C1s (288 eV) showed the same spatial correlation with Zn3d⁹. In our experiment, the sample also showed high mobility of the constituting elements. These suggest that charge conservation in excited zinc atom suggests combination between Zn3d⁹ and C^2-.

Keywords

XPS, Zn3d⁹, Charge Transfer, Spatial Symmetry of Excited States

Conflicts of Interest

The authors declare no conflicts of interest.

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