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Chalcogen, Quaternary, Monoclinic, Optics
Cs-H-O-S
Li-O-Rb-S
Cr-H-La-O
Cr-H-O-Pr
Cr-H-Nd-O
phonons
wavenumber of optical phonon
luminescence
Raman spectra
optical absorption
chalcogen
quaternary
non-disordered
transitional
nonmetal