摘要
运用相对论性的密度泛函离散变分(DV-Xα)方法模拟计算PbMoO4晶体中可能存在的F型色心的电子结构.结果表明,F,F+心在PbMoO4晶体的禁带中引入了施主能级,其光学跃迁能分别是2.141,2.186 eV,即F,F+心能分别引起PMO晶体中581,567 nm的吸收,该吸收与PbMoO4晶体中580 nm的吸收峰对应.因此,可推断F型色心能引起PMO晶体中由光色效应引起的580 nm吸收.
Electronic structures of possible F-type color centers in PbMoO4 crystals are studied within the framework of a fully relativistic selfconsistent Dirac-Slater theory with a numerically discrete variational (DV-Xa) method. The results show that: F and F^+ centers result in donor energy levels in forbidden band; optical transition energies are 2.141 eV and 2.186 eV, corresponding to 518 nm and 567 nm absorption, respectivly. The 580 nm absorption band after photo-chromic effect results from F-type color centers in PbMoO4.
出处
《计算物理》
EI
CSCD
北大核心
2008年第2期213-217,共5页
Chinese Journal of Computational Physics
基金
上海市重点学科建设(T0501)
上海市教育委员会发展基金(批准号:04EB09)资助项目