在物质结构课程中,关于近代络合物化学键理论,一般都是分别讲授晶体场理论(CFT),配位场理论和分子轨道理论(MOT)。当涉及到d—轨道能级分裂能时,只是给出“在八面体络合物中,eg轨道和t_2轨道的能级差记为Δ_0(或10D_q)称为分裂能”又说“D_q是单位”。但对D_q的真实物理含义是什么?没有给予足够的重视,造成学生对此模糊不清。本文拟从D_q的来源,表达式及其物理意义,分别给予阐述,以补课本中之不足。 In the course of material structure, the chemical bond theory of modern complexes generally teach crystal field theory (CFT), ligand field theory and molecular orbital theory (MOT) respectively. When it comes to the d-orbital energy splitting energy, it is simply given that “in the octahedral complex, the difference in energy between the eg orbit and the t 2 orbit is denoted by Δ_0 (or 10D_q) as the splitting energy” and that “D_q is the unit ”. But what is the real physical meaning of D_q? Not enough attention has been given to students’ vagueness. This article intends to elaborate from the sources, expressions and their physical meaning of D_q to make up for the deficiencies in the textbook.