In this article, we demonstrate the results of experimental and theoretical studies of F-centers in BaBrI single crystals. We have observed two types of F-centers related to an electron trapped in the iodine or bromine vacancy site. It was found that absorption bands due to F-centers can be induced either by radiation or additive coloration. The excitonic mechanism of F-center production was established and demonstrated. Optical properties of the F-centers in a monoclinic symmetry environment have been calculated by means of the embedded cluster method.

中文翻译：

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BaBrI 单晶中的 F 中心

在本文中，我们展示了 BaBrI 单晶中 F 中心的实验和理论研究结果。我们已经观察到两种类型的 F 中心与捕获在碘或溴空位中的电子有关。发现由 F 中心引起的吸收带可以由辐射或加色法引起。建立并证明了 F 中心产生的激子机制。单斜对称环境中 F 中心的光学性质已通过嵌入聚类方法计算。