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Chalcogen, Optical properties, P212121
Cr-I-O-Th
H-N-Na-O-S
B-Na-O-V
B-Ca-H-N-O
Bi-I-O
phonons
wavenumber of optical phonon
optical absorption
non-linear optics
refractive index
chalcogen
non-disordered
nonmetal
alkali
transitional
orthorhombic