→ Δ N≡C−S−C≡N N≡C−N=C=S King, Kroto and Landsberg 11 10 9 8 J 40 38 36 34 32 30 28 GHz Δ N≡C−S−C≡N → N≡C−N=C=S King, Kroto and Landsberg

v = 0 3 v=0 Bent molecule pattern 5 4 1 2 1 K l or K = 1 splitting

v = 1 3 4 1 2 1 K l or K = 1 splitting

v = 2 l or K = 1 splitting 3 2 1 1 K

Linear molecule pattern v = 3 vb= 3 Linear molecule pattern K l or K = 1 splitting 3 2 1 1

v = 0 3 5 4 1 2 1 K l or K = 1 splitting

v = 1 3 4 1 2 1 K l or K = 1 splitting

v = 2 l or K = 1 splitting 3 2 1 1 K

v = 3 K l or K = 1 splitting 3 2 1 1

H−C≡C−C≡C−C≡N 14 13 12 11 10 9 J 40 38 36 34 32 30 28 GHz

King, Kroto and Landsberg, J. Mol. Spectrosc. 113, 1-20 (1985)

Mike King and Barry Landsberg