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Kinetic Behavior of H and D Atoms in γ‐Irradiated SiO 2 as Studied by ESR Spectroscopy
Author(s) -
MIYAZAKI TETSUO,
AZUMA NAOTO,
FUEKI KENJI
Publication year - 1984
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1984.tb09623.x
Subject(s) - kinetics , reaction rate constant , activation energy , spectroscopy , deuterium , chemistry , irradiation , kinetic energy , exponential decay , quartz , analytical chemistry (journal) , crystal (programming language) , hydrogen , crystallography , materials science , atomic physics , physics , quantum mechanics , chromatography , computer science , nuclear physics , composite material , programming language , organic chemistry
The decay of hydrogen atoms, produced by γ irradiation of fused silica and quartz, was studied by ESR spectroscopy. The decay of H atoms in silica cannot be explained by a secondorder kinetics nor by a simple first‐order kinetics. Also, the decay is not composed of several first‐order processes with different activation energies. The data for the decay of H atoms can be described by a first‐order kinetic equation with a timedependent rate constant of the form k(t) = Bt α−1 , where B and α are constants. The decay kinetics of D atoms in deuterated fused silica and H atoms in a single crystal of quartz are also explained by use of the time‐dependent rate constant. The apparent activation energies for the decay of H and D atoms in the silica are 15 to 16 kJ/mol and 14 to 15 kJ/mol, respectively. The decay rates for D and H atoms in the silica are similar.