It is considered that the lattice sites A and C are partly occupied by the Cu 2+ doped. The d d electron transition spectra in the visible range show that the two deep energy levels of 2.50 eV and 2.64 eV are formed by the Cu 2+ .是什么意思_It is considered that the lattice sites A and C are partly occupied by the Cu 2+ doped. The d d electron transition spectra in the visible range show that the two deep energy levels of 2.50 eV and 2.64 eV are formed by the Cu 2+ .在线翻译_英语_读音_用法_例句