Surface processes on KBr single crystals examined by thermostimulated exo-electron emission and desorption
| Autor: | P. Hruska, Raivo Jaaniso, M. Novotny, Y. Dekhtyar, Ján Lančok, Přemysl Fitl, Aleksandr Lushchik, J. Fara, Jindřich Musil, P. Pokorny |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Potassium bromide Organic Chemistry Analytical chemistry 02 engineering and technology Electron Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound chemistry Desorption Surface layer Irradiation Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Luminescence Spectroscopy |
| Zdroj: | Optical Materials. 114:110898 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2021.110898 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect