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Chalcogen, Optical properties, P121/c1
La-O-Ti
F-O-Re
K-Nb-S-Ta
H-I-O-Se-Th
Ag-C-Eu-H-O-S
phonons
wavenumber of optical phonon
Raman spectra
optical absorption
luminescence
chalcogen
non-disordered
transitional
quaternary
nonmetal
monoclinic