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A new crystalline form of polyselenomethylene is described with an orthorhombic unit cell space group P212121 and lattice constants a = 5.37Å, b = 9.03Å, c = 4.27Å. The chains are helicoidal with the axis of the helix parallel to c. The identity period of 4.27 Å comprises two monomeric units and one turn of the helix.
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Carazzolo et al. (1967) studied this question.
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