The absorption spectra of RbCu₂Cl₃ and Rb₂Cu₃Cl₅ thin films were studied in the 2−6 eV spectral and 90−450 K temperature ranges. The localization of excitons in ${\mathrm{CuCl}}_4^{3-}$ structural elements of crystal lattice of compounds, three-dimensional nature of excitons in RbCu₂Cl₃ and two-dimensional nature of excitons in Rb₂Cu₃Cl₅ were established. The exciton spectra of RbCu₂Cl₃ and Rb₂Cu₃Cl₅ thin films were interpreted based on the transitions in the Cu⁺ ion.

中文翻译：

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RbCu2Cl3和Rb2Cu3Cl5三元化合物薄膜的激子吸收光谱

在 2-6 eV 光谱和 90-450 K 温度范围内研究了 RbCu ₂ Cl ₃和 Rb ₂ Cu ₃ Cl ₅薄膜的吸收光谱。激子的定位${\mathrm{氯化铜}}_4^{3-}$建立了化合物的晶格结构元素、RbCu ₂ Cl ₃中激子的三维性质和Rb ₂ Cu ₃ Cl ₅中激子的二维性质。基于Cu ⁺离子的跃迁解释了RbCu ₂ Cl ₃和Rb ₂ Cu ₃ Cl ₅薄膜的激子光谱。