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Far‐infrared reflectivity spectra of KH 2 PO 4 between 300 and 400 K
Author(s) -
Brehat F.,
Wynckk B.,
Hadni A.
Publication year - 1981
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.2221070235
Subject(s) - reflectivity , lattice (music) , spectral line , infrared , quantum tunnelling , infrared spectroscopy , far infrared , crystal structure , chemistry , molecular physics , materials science , atomic physics , optics , condensed matter physics , physics , crystallography , acoustics , organic chemistry , astronomy
The far‐infrared reflectivity spectra of a KDP single crystal in the temperature range 300 to 400 K are explained in terms of six lattice modes predicted by group theory and two extra modes: i) for E ‖ c , a lattice mode (ω = 183 cm −1 ) is coupled to an overdamped extra‐mode (ω 1 = 76.5 cm −1 ), ii) for E ⟂ c , five lattice modes and an overda mped extra mode without any coupling, are needed tolexplain the reflectivity data. The extra‐modes ω 1 = 76.5 cm −1 (B 2 ) and Ω 1 = 65 cm −1 (E) are probably the proton tunneling modes.