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Force constants have been calculated for Se 8  (α-monoclinic selenium) after reassigning the literature values of the fundamental frequencies and using a modified Urey-Bradley force field with six force constants. Very good agreement between observed and calculated frequencies was obtained and valence force constants were calculated. A non-linear relationship holds for SeSe stretching force constants and bond distances. Using the Se 8  force constants the fundamental frequencies of the square-planar Se 4  2+  were calculated and compared with the observed values

Vibrational Assignment and Force Constants of Cyclo Octaselenium, Se 8 , and of the Cyclo Tetraselenium(2+) Cation, Se 4 2+