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UV Absorption of Ag + Doped Alkali Halide Crystals
Author(s) -
Fussgaenger K.,
Martienssen W.,
Bilz H.
Publication year - 1965
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.19650120138
Subject(s) - halide , alkali metal , phonon , doping , lattice (music) , absorption spectroscopy , atomic physics , oscillator strength , ion , chemistry , absorption (acoustics) , resonance (particle physics) , spectral line , condensed matter physics , inorganic chemistry , physics , optics , organic chemistry , astronomy , acoustics
Absorption spectra of Ag + doped NaCl, KCl, KBr, and KJ are measured at low temperatures in the spectral range from 6.8 to 4.4 eV. The fine structure of the Ag + bands and their temperature dependence are investigated. The oscillator strenghts at low temperatures are in the order of 10 −3 . These Ag + absorption bands are due to vibronic transitions: The parity‐forbidden electronic transitions 4d 10 → 4d 9 5s are allowed by an interaction with odd phonons. The temperature dependence of the oscillator strengths can be fitted by a function which takes care of one‐ and two‐phonon processes. This function contains an effective lattice frequency which turns out to lie on the low‐frequency side of the acoustic branches of the host lattice near the resonance mode of the Ag + ion.