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Lifetime of excited Cu + in alkali halides
Author(s) -
Baldini G.,
Jean A.,
Spinolo G.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680250208
Subject(s) - excited state , halide , ion , alkali metal , impurity , excitation , chemistry , vacancy defect , absorption (acoustics) , crystal (programming language) , atomic physics , analytical chemistry (journal) , potassium , single crystal , copper , inorganic chemistry , materials science , crystallography , physics , organic chemistry , quantum mechanics , chromatography , computer science , programming language , composite material
An experimental study is made of the time decay of excited Cu + ions diluted in potassium halides in order to determine the role of the host crystal in the impurity absorption and emission processes. The Cu + ions are responsible for a few ultraviolet absorption bands which, after optical stimulation, give rise to emission at ≈ 4000 Å. The lifetime, τ R , of the lowest excited state, presumably 3d 9 4s, is measured and found to be ≈ 50 μs in KCl:Cu, ≈ 100 μs in KBr:Cu and ≈ 5 μs in KI:Cu). The thermal de‐excitation energies, Δ E d , are also measured and found to be ≈ 0,73 eV (KCl:Cu), ≈ 0,76 eV (KBr:Cu), ≈ 0,61 eV (KI:Cu). These results together with measurements of other workers may suggest that the transition 3d 10 ≈ 3d 9 4s, forbidden in the free ion, becomes partially allowed due to the crystal field. The implications of an off‐centre position of the Cu + ion inthe K + vacancy are also discussed and found to be consistent with the experimental data.