The peculiarities of hydroxyl impurity behaviour in crystalline LiF and MgO matrices under the action of radiation

Abstract

PACS 61. 78.40.Fy The comparative analysis of the results obtained in the investigation of infrared absorption spectra of irradiated lithium fluoride and magnesium oxide samples has been made. For irradiation of the samples X-ray generator, Co 60 source and different reactors were used . The universal linear dependence of bands caused by centers containing OH -ions was observed for the first time in the irradiated MgO samples.. The thermal treatment of irradiated LiF crystals have clearly showed the interconnection of hydroxyl ions and hydrogen products of their dissociation.The significant difference in the behaviour of impurity hydroxyl ions in matrices of the mentioned ionic compounds was observed.

Thermoluminescence and absorption spectra of MgO crystals irradiated by fast neutron fluxes of low intensity

“…The leading role in the description of the above processes should be played by the hydroxyl ions, especially as they are formed and distorted relatively easily in neutron‐irradiated MgO crystals. They are formed by irradiation even in the crystals in which their presence was not observed earlier 9. In our opinion, in this process the important role is played by anion interstitials (O).…”

Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

“…[15] Irradiation of LiF with ionizing radiation-X-rays, electrons, ions, extreme UV light, etc.-causes the stable formation of primary and aggregate point defects. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] Aggregate F 2 and F 3 þ color centers -two electrons bound to two and three close anion vacancies, respectively-feature visible Stokes-shifted emission in the red (F 2 ) and green (F 3 þ ). [32] As it is well known, the same color center F 2 , F 3 þ (Table 2) are produced in LiF under thermal neutron and γ-ray irradiation at room temperature.…”

Преобразования радиационно-наведенных молекулярных точечных дефектов и центров окраски в кристаллах LiF под воздействием света

“…Также кислородные и водородные дефекты участвуют вместе с ионами и молекулами фтора в образовании молекулярных комплексов с водородной связью (МК с H-связью). Природа МК с H-связью и идентификация колебательных ИК-полос МК с H-связью и U 1 -центров (ионов водорода в междоузлии) до сих пор являются дискуссионными [5,8,[23][24][25][26][27][28][29][30][31][32][33][34][35][36]. Вследствие воздействия ионизирующего излучения в кристалле создаются ЦО, молекулярные дефекты, наночастицы лития (коллоиды лития) и скопления пузырьков газа фтора [2,[37][38][39][40][41].…”