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Chemical Aspects of the Generation, Trapping, and Decay of Atomic Hydrogen in AlF 3 and CaF 2
Author(s) -
Stößer Reinhard,
Ahrens Mike,
Scholz Gudrun
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500572
Subject(s) - chemistry , hydrogen , hyperfine structure , electron paramagnetic resonance , spectroscopy , ionizing radiation , analytical chemistry (journal) , photochemistry , irradiation , atomic physics , nuclear magnetic resonance , organic chemistry , physics , quantum mechanics , nuclear physics
Hydrogen atoms were generated in the matrices AlF 3 and CaF 2 at room temperature by ionizing radiation (γ and UV) and were investigated by electron paramagnetic resonance spectroscopy. To gain information on the nature of the hydrogen precursors and hydrogen traps within the solid matrices, studies regarding defined thermal and chemical influence, as well as mechanical impact on the fluoridic matrices before and after irradiation were the focus of this work. Impurities such as HO – and hydrocarbons were identified as potential precursors. The hydrogen traps were characterized by means of their spatial distribution within the different samples and by their energetic states (“trap‐depth”). In this respect, the rate constants, which were determined for different temperatures, turned out to be a valuable tool. Similarities and differences regarding the generation and stabilization of atomic hydrogen in AlF 3 and CaF 2 were worked out. Also, the influence of the type of ionizing radiation was elucidated. Whereas the comparison of AlF 3 and CaF 2 was dominated by similarities, significant differences were found for rather molecular siloxane cages R 8 Si 8 O 12 , especially regarding their reaction upon UV excitation and the possibility to resolve super‐hyperfine splittings.