Long‐Wavelength Optical Phonons of AgBr  x  Cl 1− x   Mixed Crystals | Zendy

Bootz B. | Zendy; von der Osten W. | Zendy; Uhle N. | Zendy

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Long‐Wavelength Optical Phonons of AgBr x Cl 1− x Mixed Crystals

Author(s) -

Bootz B.,

von der Osten W.,

Uhle N.

Publication year - 1974

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.2220660118

Subject(s) - phonon , raman scattering , raman spectroscopy , crystal (programming language) , wavelength , excitation , scattering , infrared , optics , spectral line , molecular physics , physics , materials science , atomic physics , condensed matter physics , quantum mechanics , computer science , programming language , astronomy

Infrared reflectivity and second‐order Raman scattering in the mixed crystal system AgBr x Cl 1− x , were studied at 77 K. The TO(Γ) and LO(Γ) phonon frequencies obtained by means of a Kramers‐Kronig analysis shift continuously between their energetic positions in the pure components indicating one‐mode behaviour of the system. This result is discussed in view of a recent model that describes the optical modes of a mixed crystal. The LO(Γ) phonon frequencies taken from the Raman spectra are found to be slightly lower. A resonant enhancement of the 2L0 scattering process that occurs for z = 0.42 with shorter‐wavelength excitation is used to determine the longitudinal optical phonon frequency.

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