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Impurity‐Induced Far‐Infrared Absorption in the Phonon Gap Regions of KI and KBr
Author(s) -
Grisar R. G. J.,
Reiners K. P.,
Renk K. F.,
Genzel L.
Publication year - 1967
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.19670230222
Subject(s) - impurity , far infrared , doping , phonon , infrared , absorption (acoustics) , grating , spectrometer , infrared spectroscopy , chemistry , materials science , analytical chemistry (journal) , optics , optoelectronics , physics , condensed matter physics , organic chemistry , chromatography
Measurements are made on doped KI and KBr using a far‐infrared grating spectrometer, which is briefly described. The absorption of KI:OD − at 4.3 °K exhibits localized vibrational and translational gap modes. An attempt to assign these modes is made by proposing a term scheme. Measurements of doped KBr between 2.5 and 80 °K confirm the boundaries of the acoustic‐optical gap as 96 cm −1 and 100 cm −1 , respectively.