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Ultraviolet absorption and emission of CN − centres in alkali halides
Author(s) -
von der Heyden E.,
Fischer F.
Publication year - 1975
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.2220690107
Subject(s) - excited state , ultraviolet , chemistry , valence (chemistry) , luminescence , bond dissociation energy , dissociation (chemistry) , halide , absorption spectroscopy , photochemistry , atomic physics , analytical chemistry (journal) , materials science , inorganic chemistry , optics , optoelectronics , physics , organic chemistry , chromatography
The ultraviolet absorption of CN − centres is studied in NaCl, KCl, RbCl, and NaBr single crystals, as well as the ultraviolet luminescence of NaBr:CN − . At low temperatures several CN − absorption bands are resolved from the low energy tail of the ultraviolet host absorption. These bands refer to the generation of valence vibrations of the excited CN − molecule. The ultraviolet luminescence of NaBr:CN − consists of well separated nearly equidistant bands (Δ E ≈ 0.26 eV) in the range between 213 and 374 nm. This structure is refered to valence vibrations of the ground state CN − . The valence vibrations are described by Morse potentials. The experimental data allow the determination of the potential parameters, especially of the bond dissociation energy and of the change of the internuclear distance due to the electronic transition.