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Surface processes on KBr single crystals examined by thermostimulated exo-electron emission and desorption
Optical Materials ( IF 3.9 ) Pub Date : 2021-02-19 , DOI: 10.1016/j.optmat.2021.110898
P. Pokorny , M. Novotny , Y. Dekhtyar , A. Lushchik , P. Hruska , J. Fara , P. Fitl , J. Musil , R. Jaaniso , J. Lancok

Potassium bromide (KBr) is a material with many potential uses in various branches of physics and technology (in scintillators, for a Fourier spectrometer, electro-optical elements such as IR laser windows, sensors and optical fibers). We conducted a series of combined measurements of thermally stimulated exo-electron emission (TSEE) and thermally stimulated desorption (TSD). At low doses of UV irradiation, the most prominent process is the combined emission of negative charges with desorption of the components of O, H2O and mainly K, KOH and Br, as described below. At higher irradiation doses, the KBr F-center plays the most important role (Tm = 160 °C) and at temperatures above +200 °C also the decomposition of chemically bonded atoms and other components occurs. This process is accompanied by the corresponding emission of electrons and at the same time some of the already chemically bonded structures such as HBr3 are released. TSD maxima are defined and the same temperature maxima for TSD and TSEE are shown, mainly at the already mentioned higher temperatures. These maxima are linked to the defects and interactions in the surface layer. The obtained results fully confirm the applicability of our apparatus for combined measurements of TSD, TSEE, thermally stimulated luminescence (TSL) and possibly also thermally stimulated conductivity (TSC).



中文翻译:

通过热激发外电子发射和解吸检查KBr单晶的表面过程

溴化钾(KBr)是在物理学和技术的各个分支中具有许多潜在用途的材料(在闪烁器中,用于傅立叶光谱仪,是电光元件,例如IR激光窗,传感器和光纤)。我们对热激发的电子发射(TSEE)和热激发的解吸(TSD)进行了一系列组合测量。在低剂量的紫外线照射下,最突出的过程是负电荷的释放与O,H 2 O的成分以及主要是K,KOH和Br的解吸相结合,如下所述。在较高的辐照剂量下,KBr F中心起着最重要的作用(T m = 160°C),并且在+200°C以上的温度下,还会发生化学键合原子和其他成分的分解。该过程伴随有相应的电子发射,并且同时释放了一些已经化学键合的结构,例如HBr 3。定义了TSD最大值,并显示了TSD和TSEE的相同温度最大值,主要是在已经提到的较高温度下。这些最大值与表面层中的缺陷和相互作用有关。所获得的结果充分证实了我们的设备可用于TSD,TSEE,热激发发光(TSL)以及可能的热激发电导率(TSC)的组合测量。

更新日期:2021-02-19
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