用紫外可见分光光度计测量了碲镉汞样品的反射谱，在基本反射区有两个主要反射峰Ｅ１和Ｅ２，Ｅ１峰分裂为双峰结构．利用电子跃迁的量子理论，指认Ｅ１峰为〈１１１〉方向Λ４，５→Λ６的跃迁；Ｅ１＋Δ１峰为〈１１１〉方向Λ６→Λ６的跃迁；Ｅ２峰为〈１００〉方向Ｘ７→Ｘ６的跃迁．计算结果与实验结果相符 The reflectance spectra of HgCdTe samples were measured by UV-visible spectrophotometer. There were two main reflection peaks E1 and E2 in the basic reflection region, and the E1 peak was split into a bimodal structure. Using the quantum theory of electron transition, the E1 peak is identified as the transition of Λ4,5 → Λ6 in the <111> direction; the E1 + Δ1 peak is the transition of the Λ6 → Λ6 in the <111> direction; and the E2 peak is the transition of the X7 → X6 in the <100> direction. The calculation results are consistent with the experimental results