The known experimental absorption spectra were used to calculate the dielectric spectra of GeTe, SnTe, and PbTe crystals in the region of electron transitions from the core d-bands of cations. Their characteristic features and general regularities are revealed. Using the combined Argand diagram method, the dielectric spectra of each crystal were decomposed into six elementary oscillators and their main parameters were determined. The nature of formation of these oscillators is proposed on the basis of the theory of interband and exciton transitions.

中文翻译：

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锗、锡和碲化铅的介电光谱和 d 波段结构

已知的实验吸收光谱用于计算来自阳离子核心 d 带的电子跃迁区域中 GeTe、SnTe 和 PbTe 晶体的介电​​光谱。揭示了它们的特征和一般规律。使用组合Argand图方法，将每个晶体的介电​​光谱分解为六个基本振子，并确定了它们的主要参数。这些振荡器的形成性质是根据​​带间跃迁和激子跃迁理论提出的。