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Alkali, Chalcogen, Energy gap for direct transition, K-Se
P1307226-1
P1307227-1
P1612659-3
P1919414-1
P1300605-3
P50022040-5
P50123029-5
P50022041-5
P50118235-7
P50030079-9
P50090144-7
P50119884-11
P50062366-3