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Chalcogen, Nonmetal, Optical properties, P121/c1
K-Nb-S-Ta
H-I-O-Se-Th
Ag-C-Eu-H-O-S
Ag-C-H-O-S-Sm
O-Se-Th
phonons
wavenumber of optical phonon
luminescence
values of luminescence
optical absorption
chalcogen
nonmetal
non-disordered
transitional
rare earth
monoclinic