return to home page

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 CCD/cc-pVTZ
Calculated values were scaled by 0.9337.

Species Name mode Symmetry Experiment Theory difference ratio
CH3NH2 methyl amine 14 A" 1195 922 -273 1.296
HCN+ hydrogen cyanide cation 2 Σ 1800 2546 746 0.707
CBr2F2 Methane, dibromodifluoro- 3 A1 140 331 191 0.422
NH2CN cyanamide 5 A' 408 634 226 0.644
COBr2 Carbonic dibromide 4 B1 757 502 -255 1.507
COBr2 Carbonic dibromide 6 B2 512 345 -167 1.486
CH3 Methyl radical 2 A2" 606 465 -141 1.303
C2Cl2+ dichloroacetylene cation 5 Πu 233 180 -53 1.293
AsH3+ Arsine cation 2 A1 452 662 210 0.683
O3 Ozone 3 B2 1042 1566 524 0.665
N2O3 Dinitrogen trioxide 9 A" 63 130 67 0.483
C3 carbon trimer 3 Πu 63 99 35 0.643
SiH- silicon monohydride anion 1 Σ 2175 1716 -459 1.267
SO+ sulfur monoxide cation 1 Σ 1360 2500 1140 0.544