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XIII.F.2. (III.B.7.b.) (IV.C.7.) (XVIII.B.2.)

Bad vibrational frequency predictions

Calculated frequencies that differ from experiment by more than 400 cm-1 or have a ratio with experiment outside of 0.7 to 1.2 are listed

Calculated vibrational frequencies ("theory" in table) are calculated at MP2FU/aug-cc-pVTZ
Calculated values were scaled by 0.9668.

Species Name mode Symmetry Experiment Theory difference ratio
NH2CN cyanamide 5 A' 408 601 193 0.679
CN Cyano radical 1 Σ 2069 2819 750 0.734
C2H+ Ethynyl cation 3 Π 550 794 244 0.692
C2H3+ vinyl cation 2 A1 2217 2950 733 0.752
C2Cl2+ dichloroacetylene cation 5 Πu 233 182 -51 1.278
O3 Ozone 3 B2 1042 2134 1091 0.488