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1. 中国工程物理研究院流体物理研究所,绵阳,621900
2. 四川大学物理系,成都,610064
纸质出版日期:2001-02-01
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[1]陈军,林理彬,何捷,卢勇,何维.MgO晶体中F型色心的电子结构和光学吸收谱研究[J].核技术,2001(02):89-93.
CHEN Jun. Electronic structure of F type color center in MgO and optical absorption transition[J]. Nuclear techniques, 2001, (2): 89-93.
运用嵌入原子簇的电荷自洽离散变分方法(SCC-DVM-Xα方法)对MgO晶体中F型色心的电子结构进行了计算,并利用能量最小原理优化了色心格点周围的Mg,O离子结构,得到了MgO晶体中 F,F+和 F2+心的能带,态密度,并讨论了色心的光学跃迁模式。计算结果表明,F,F+和 F2+心在 MgO晶体的禁带中引入了色心能级,F和 F+心的光学跃迁能分别是 4. 67eV和 4. 66eV,电子从色心激发态跃迁到导带底需要吸收大的光电子跃迁能量。计算结果与实验结果符合较好,说明计算结果是合理的。
The electronic structure of MgO crystal with F type color center has been studied with the relaxation of ions around vacancy by using the SCC -- DVM -- Xa methods. The energy band
bulk density of states and mulliken efficient charge have been calculated. Also
the optic transition model has been discussed. Our calculation results showed that F
F+ and F2+ -- center in MgO crystal introduced defect energy levels in the forbidden gap. The calculated absorption energies for F and F+- center were 4. 67eV and 4. 66eV
respectively. Also
big photoelectron energies were required for F and F+ --centers. The good agreement with experimental data showed the reasonableness of the calculated results.
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