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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/cc-pVTZ
Calculated values were scaled by 0.9494.

Species Name mode Symmetry Experiment Theory difference ratio
HCN+ hydrogen cyanide cation 2 Σ 1800 2703 903 0.666
CH3COOCH3 methyl acetate 27 A" 110 66 -44 1.673
C6H4O2 parabenzoquinone 30 B3u 109 89 -20 1.224
C3H2N2 Malononitrile 6 A1 167 136 -31 1.225
C4H8O Furan, tetrahydro- 33 B 137 65 -72 2.102
C4H9N Pyrrolidine 36 A" 65 49 -16 1.333
C5H8 Cyclopentene 18 A' 254 180 -74 1.414
CH2NN diazomethane 6 B1 406 227 -179 1.786
NH2CN cyanamide 5 A' 408 610 202 0.669
C2H3NO3 Oxamic acid 16 A" 984 812 -172 1.212
C2H3NO3 Oxamic acid 18 A" 745 613 -132 1.215
C2H3NO3 Oxamic acid 21 A" 162 67 -95 2.420
C5H8 1,4-Pentadiene 16 A 137 292 155 0.469
CO+ carbon monoxide cation 1 Σ 2214 2731 517 0.811
C3H6O2 1,3-Dioxolane 6 A 1361 2869 1508 0.474
C3H6O2 1,3-Dioxolane 13 A 658 1235 577 0.533
C5H8 1,3-Pentadiene, (Z)- 22 A' 144 212 68 0.678
C5H8 1,3-Pentadiene, (Z)- 31 A" 456 348 -108 1.312
C5H8 1,3-Pentadiene, (Z)- 32 A" 171 140 -31 1.222
CN Cyano radical 1 Σ 2069 2761 692 0.749
C2H Ethynyl radical 2 Σ 1841 2406 566 0.765
C2H Ethynyl radical 3 Π 372 779 408 0.477
O2+ diatomic oxygen cation 1 Σg 1906 1447 -459 1.317
AsH3+ Arsine cation 2 A1 452 685 233 0.659
C3 carbon trimer 3 Πu 63 179 116 0.354
NCO isocyanato radical 1 Σ 1921 2349 428 0.818
CH3NH2 methyl amine 14 A" 1195 935 -260 1.278
HCN+ hydrogen cyanide cation 1 Σ 3050 3515 466 0.868
C4H6O2 2,3-Butanedione 9 Ag 614 509 -105 1.206
C4H6O2 2,3-Butanedione 21 Bg 240 133 -107 1.805
C2H3NO3 Oxamic acid 3 A' 2600 3458 858 0.752
C2H3NO3 Oxamic acid 15 A' 328 261 -67 1.257
C2H3NO3 Oxamic acid 17 A" 815 652 -163 1.250
C5H8 1,4-Pentadiene 17 A 102 84 -18 1.222
C3H6O2 1,3-Dioxolane 4 A 1509 2952 1443 0.511
C2Cl2+ dichloroacetylene cation 5 Πu 233 185 -48 1.257
SCN thiocyanato radical 1 Σ 1942 2396 453 0.811
N2O3 Dinitrogen trioxide 9 A" 63 161 98 0.390
SiH- silicon monohydride anion 1 Σ 2175 1794 -381 1.212
SO+ sulfur monoxide cation 1 Σ 1360 3544 2184 0.384
PN+ phosphorus nitride cation 1 Σ 1200 1604 404 0.748
C4H6O2 2,3-Butanedione 13 Au 1111 919 -192 1.209
C5H8 1,4-Pentadiene 31 B 721 598 -123 1.205
C5H8 1,4-Pentadiene 33 B 331 98 -233 3.371
C3H6O2 1,3-Dioxolane 5 A 1480 2911 1431 0.508