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Investigation on the far‐infrared response of DKDP by asymmetric fourier spectroscopy
Author(s) -
Happ H.,
Rother G.
Publication year - 1977
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.2220790209
Subject(s) - spectrometer , reflection (computer programming) , fourier transform , ferroelectricity , infrared , amplitude , deuterium , infrared spectroscopy , spectroscopy , fourier transform infrared spectroscopy , analytical chemistry (journal) , optics , materials science , atomic physics , physics , chemistry , nuclear magnetic resonance , optoelectronics , dielectric , quantum mechanics , chromatography , computer science , programming language
The complex amplitude reflection coefficient of K(H 1− x D x ) 2 PO 4 , x = 0.86, is measured with E ∥ c and E ⟂ c between 15 and 360 cm 1 at room temperature and between 15 and 130 cm −1 at three lower temperatures using an asymmetric Fourier spectrometer. The spectra of both ε′(ω) and ε″(ω) derived thereof are presented. For E ∥ c the ferroelectric mode at room temperature is seen below ω ≈ 30 cm 1 and can be described by a Debye formula with ω r = 1/τ 3.12 cm 1 . For E ⟂ c there is also a low frequency mode due to deuteron motion which can be described by an overdamped oscillator at ω 0 = 22 cm 1 .