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 PBEPBE/aug-cc-pVDZ
Calculated values were scaled by 0.9939.

Species Name mode Symmetry Experiment Theory difference ratio
C3H4O2 β–Propiolactone 21 A" 113 182 69 0.620
CH3CONH2 Acetamide 20 A 259 210 -49 1.234
CH3COOH Acetic acid 18 A" 93 47 -46 1.960
CH3OH Methyl alcohol 12 A" 200 305 105 0.657
C2H6O2S Dimethyl sulfone 13 A2 326 259 -67 1.258
C2H6O2S Dimethyl sulfone 20 B1 262 183 -79 1.432
C2H6O2S Dimethyl sulfone 19 B1 396 315 -81 1.259
C2H2 Acetylene 4 Πg 612 495 -117 1.237
CH3NH2 methyl amine 14 A" 1195 937 -258 1.276
CH3CHClCH3 Propane, 2-chloro- 27 A" 276 227 -49 1.218
CH3COCl Acetyl Chloride 15 A" 166 125 -41 1.324
CBr2F2 Methane, dibromodifluoro- 3 A1 140 318 178 0.440
CHOCH(CH3)CH3 Propanal, 2-methyl- 16 A' 632 526 -106 1.201
C3H6O 2-Propen-1-ol 24 A 188 110 -78 1.715
C3H6O 2-Propen-1-ol 21 A 554 431 -124 1.287
C2H2O2 Ethanedial 7 Au 127 106 -21 1.201
C5H12 Pentane 23 A2 131 108 -23 1.216
C3H2N2 Malononitrile 6 A1 167 136 -31 1.229
C4H8O Furan, tetrahydro- 17 A 286 238 -48 1.203
C4H8O Furan, tetrahydro- 33 B 137 31 -106 4.358
C4H9N Pyrrolidine 36 A" 65 95 30 0.682
C5H8 Cyclopentene 18 A' 254 132 -122 1.923
C3H3NO Isoxazole 14 A" 1033 848 -185 1.218
C4H4N2 Pyridazine 13 A2 421 344 -77 1.225
C5H12 Propane, 2,2-dimethyl- 12 T1 203 306 103 0.664
C2H3NO3 Oxamic acid 16 A" 984 792 -192 1.243
C2H3NO3 Oxamic acid 15 A' 328 254 -74 1.291
C2H3NO3 Oxamic acid 17 A" 815 662 -153 1.231
C2H3NO3 Oxamic acid 21 A" 162 69 -93 2.353
C2H3NO3 Oxamic acid 3 A' 2600 3465 865 0.750
CH3CCCH3 2-Butyne 16 E" 371 258 -113 1.437
C3O2 Carbon suboxide 7 Πu 61 12 -49 5.040
C5H8 1,4-Pentadiene 31 B 721 587 -134 1.229
C5H8 1,4-Pentadiene 33 B 331 100 -231 3.324
C5H8 1,4-Pentadiene 17 A 102 85 -17 1.201
C5H8 1,4-Pentadiene 16 A 137 288 151 0.476
C6H10 1,5-Hexadiene 29 Bg 264 189 -75 1.399
C6H10 1,5-Hexadiene 14 Ag 351 254 -97 1.380
C6H10 1,5-Hexadiene 20 Au 649 540 -109 1.201
COBr2 Carbonic dibromide 6 B2 512 329 -183 1.558
COBr2 Carbonic dibromide 4 B1 757 497 -260 1.524
CH3SCH2CH3 Ethane, (methylthio)- 18 A' 227 184 -43 1.233
CH3ONO Methyl nitrite 15 A" 186 151 -35 1.231
CH3SSCH3 Disulfide, dimethyl 13 A 117 97 -20 1.200
C3H6O2 1,3-Dioxolane 5 A 1480 2917 1437 0.507
C3H6O2 1,3-Dioxolane 4 A 1509 2946 1437 0.512
C3H6O2 1,3-Dioxolane 6 A 1361 2840 1479 0.479
C3H6O2 1,3-Dioxolane 13 A 658 1208 550 0.545
C6H10 2-Hexyne 25 A' 115 94 -21 1.228
C6H10 2-Hexyne 38 A" 392 276 -116 1.420
C3H7N Cyclopropylamine 12 A' 989 806 -183 1.228
C4N2 2-Butynedinitrile 7 Πg 263 181 -82 1.451
SiF2 Silicon difluoride 2 A1 345 286 -59 1.207
SiF2 Silicon difluoride 2 A1 278 228 -51 1.222
CH3OCH2CN Methoxyacetonitrile 15 A' 243 170 -73 1.432
CH3OCH2CN Methoxyacetonitrile 24 A" 113 86 -27 1.317
C5H8 1,3-Pentadiene, (E)- 32 A" 129 209 80 0.617
C5H8 1,3-Pentadiene, (E)- 31 A" 361 258 -103 1.400
SF6 Sulfur Hexafluoride 5 T2g 525 432 -93 1.216
CH2OH Hydroxymethyl radical 9 A 234 395 161 0.592
C6H8 1,3,5-Hexatriene, (Z)- 24 B1 358 107 -251 3.340
C6H8 1,3,5-Hexatriene, (Z)- 11 A1 1136 871 -265 1.304
C6H8 1,3,5-Hexatriene, (Z)- 19 A2 264 179 -85 1.473
SO2F2 Sulfuryl fluoride 3 A1 544 448 -96 1.214
SO2F2 Sulfuryl fluoride 9 B2 553 438 -115 1.261
SO2F2 Sulfuryl fluoride 4 A1 385 302 -83 1.274
SO2F2 Sulfuryl fluoride 5 A2 388 303 -85 1.282
SO2F2 Sulfuryl fluoride 7 B1 539 440 -99 1.225
H2CCCCH2 Butatriene 16 B3g 330 14 -316 23.495
H2CCCCH2 Butatriene 10 B2g 544 404 -140 1.347
C3H3 Propargyl radical 7 B1 490 376 -114 1.302
C4H6 Methylenecyclopropane 17 B1 360 261 -99 1.378
C2Cl2 dichloroacetylene 4 Πg 333 214 -119 1.556
ClFO3 Perchloryl fluoride 3 A1 549 434 -115 1.264
ClFO3 Perchloryl fluoride 5 E 589 464 -125 1.268
ClFO3 Perchloryl fluoride 6 E 405 304 -101 1.333
PF5 Phosphorus pentafluoride 8 E" 520 428 -92 1.215
H2SO4 Sulfuric acid 7 A 379 306 -73 1.239
H2SO4 Sulfuric acid 13 B 558 464 -94 1.202
H2SO4 Sulfuric acid 5 A 548 452 -96 1.212
H2SO4 Sulfuric acid 14 B 506 415 -91 1.218
PF3 Phosphorus trifluoride 4 E 344 282 -62 1.220
PF3 Phosphorus trifluoride 2 A1 487 397 -90 1.227
SiF4 Silicon tetrafluoride 2 E 268 217 -51 1.233
AsH3+ Arsine cation 2 A1 452 662 210 0.683
HSO3F Fluorosulfonic acid 8 A 551 444 -107 1.240
HSO3F Fluorosulfonic acid 9 A 518 425 -93 1.218
HSO3F Fluorosulfonic acid 11 A 390 302 -88 1.292
HSO3F Fluorosulfonic acid 7 A 562 457 -105 1.229
BrF5 bromine pentafluoride 6 B2 281 186 -95 1.513
BrF5 bromine pentafluoride 8 E 415 336 -79 1.233
BrF5 bromine pentafluoride 3 A1 369 294 -75 1.257
ClF3 Chlorine trifluoride 6 B2 442 340 -102 1.298
ClF3 Chlorine trifluoride 3 A1 328 238 -90 1.377
SO2Cl2 Sulfuryl chloride 3 A1 408 339 -69 1.202
SO2Cl2 Sulfuryl chloride 4 A1 218 177 -41 1.235
SO2Cl2 Sulfuryl chloride 5 A2 282 231 -51 1.220
SO2Cl2 Sulfuryl chloride 7 B1 388 321 -67 1.210
PCl5 Phosphorus pentachloride 2 A1' 370 267 -103 1.385
PCl5 Phosphorus pentachloride 7 E' 100 76 -24 1.317
N2O4 Dinitrogen tetroxide 9 B2u 265 185 -80 1.434
F3PO Phosphoryl fluoride 6 E 336 271 -65 1.242
F3PO Phosphoryl fluoride 5 E 482 391 -91 1.234
ClOO chloroperoxy radical 3 A' 201 292 91 0.689
B2H6 Diborane 14 B2u 368 298 -70 1.234
GeH2 germylene 2 A1 916 1797 881 0.510
GeH2 germylene 1 A1 1856 899 -957 2.064
Mg2 Magnesium diatomic 1 Σg 51 104 53 0.493