three n. 1.三个人[东西]。 2.三岁,三时。 3.【板球】3字型。 three and six 〔英国〕三先令六辨士〔3s. 6d.〕。 three ten 〔英国〕三镑十先令〔£3 10s.〕。 a child of three 三岁的孩子。 the One in T- =the T- in One 【宗教】(上帝的)三位一体。 by [in] threes=three by three 每三个(人);三个三个地。
On the basis of one - electron hartree - fock approximation , the extended - ion method and ab initio method have been used to investigate the f center migration between f ~ - layers , br ~ - layers and from f ~ - layer to br ~ - layer . we have calculated the energy barrier of these three f center migrationes and energy of f center , exciton energy . the results of f center and exciton are in good agreement with the experimential data 本文是在单电子hartree - fock近似的基础上采用扩展离子方法和全电子从头计算方法,研究了bafbr : eu ~ ( 2 + )晶格中的f ~ -离子层间的f心迁移, br ~ -层的f心迁移和f ~ -离子与br ~ -离子层间f心迁移过程中的能量势垒和f心基态、激发态以及激子能量,对于f心和激子的研究结果与实验符合的很好。