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
CH3OH Methyl alcohol 12 A" 200 305 105 0.657
CH3OH Methyl alcohol 12 A" 200 304 104 0.658
CH3OH Methyl alcohol 12 A" 200 305 105 0.657
CH3OH Methyl alcohol 12 A" 200 304 104 0.658
CH3COOH Acetic acid 18 A" 93 47 -46 1.960
CH3CONH2 Acetamide 20 A 259 210 -49 1.234
C2H6O2S Dimethyl sulfone 13 A2 326 259 -67 1.258
C2H6O2S Dimethyl sulfone 19 B1 396 315 -81 1.259
C2H6O2S Dimethyl sulfone 20 B1 262 183 -79 1.432
C2H2 Acetylene 4 Πg 612 495 -117 1.237
CH3CHClCH3 Propane, 2-chloro- 27 A" 276 227 -49 1.218
CH3CHClCH3 Propane, 2-chloro- 27 A" 276 226 -50 1.219
CH3CHClCH3 Propane, 2-chloro- 27 A" 276 227 -49 1.218
CH3CHClCH3 Propane, 2-chloro- 27 A" 276 226 -50 1.219
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
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
C4H9N Pyrrolidine 36 A" 65 95 30 0.682
C5H8 Cyclopentene 18 A' 254 132 -122 1.923
C4H4N2 Pyridazine 13 A2 421 344 -77 1.225
C5H12 Propane, 2,2-dimethyl- 12 T1 203 306 103 0.664
C2H3NO3 Oxamic acid 3 A' 2600 3465 865 0.750
C3O2 Carbon suboxide 7 Πu 61 12 -49 5.040
C2H3NO3 Oxamic acid 15 A' 328 254 -74 1.291
C2H3NO3 Oxamic acid 16 A" 984 792 -192 1.243
C2H3NO3 Oxamic acid 17 A" 815 662 -153 1.231
C2H3NO3 Oxamic acid 21 A" 162 69 -93 2.353
CH3CCCH3 2-Butyne 16 E" 371 258 -113 1.437
C5H8 1,4-Pentadiene 16 A 137 288 151 0.476
C5H8 1,4-Pentadiene 17 A 102 85 -17 1.201
C6H10 1,5-Hexadiene 14 Ag 351 254 -97 1.380
C6H10 1,5-Hexadiene 20 Au 649 540 -109 1.201
C6H10 1,5-Hexadiene 29 Bg 264 189 -75 1.399
COBr2 Carbonic dibromide 4 B1 757 497 -260 1.524
COBr2 Carbonic dibromide 6 B2 512 329 -183 1.558
CH3ONO Methyl nitrite 15 A" 186 151 -35 1.231
CH3SSCH3 Disulfide, dimethyl 13 A 117 97 -20 1.200
CH2D2 methane-d2 6 B1 3013 2281 -732 1.321
CH2D2 methane-d2 8 B2 2234 3081 847 0.725
CH3SCH2CH3 Ethane, (methylthio)- 18 A' 227 184 -43 1.233
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
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)- 11 A1 1136 871 -265 1.304
C6H8 1,3,5-Hexatriene, (Z)- 19 A2 264 179 -85 1.473
C6H8 1,3,5-Hexatriene, (Z)- 24 B1 358 107 -251 3.340
SO2F2 Sulfuryl fluoride 3 A1 544 448 -96 1.214
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
SO2F2 Sulfuryl fluoride 9 B2 553 438 -115 1.261
H2CCCCH2 Butatriene 10 B2g 544 404 -140 1.347
H2CCCCH2 Butatriene 16 B3g 330 14 -316 23.495
C3H3 Propargyl radical 7 B1 490 376 -114 1.302
ClFO3 Perchloryl fluoride 6 E 405 304 -101 1.333
C2Cl2 dichloroacetylene 4 Πg 333 214 -119 1.556
HClO4 perchloric acid 6 A' 569 457 -112 1.246
HClO4 perchloric acid 7 A' 548 437 -111 1.255
HClO4 perchloric acid 8 A' 405 317 -88 1.277
HClO4 perchloric acid 10 A" 576 461 -115 1.251
HClO4 perchloric acid 11 A" 408 322 -86 1.267
HClO4 perchloric acid 12 A" 191 129 -62 1.483
ClFO3 Perchloryl fluoride 3 A1 549 434 -115 1.264
ClFO3 Perchloryl fluoride 5 E 589 464 -125 1.268
C4H6 Methylenecyclopropane 17 B1 360 261 -99 1.378
PF5 Phosphorus pentafluoride 8 E" 520 428 -92 1.215
H2SO4 Sulfuric acid 5 A 548 452 -96 1.212
H2SO4 Sulfuric acid 7 A 379 306 -73 1.239
H2SO4 Sulfuric acid 13 B 558 464 -94 1.202
H2SO4 Sulfuric acid 14 B 506 415 -91 1.218
AsH3+ Arsine cation 2 A1 452 662 210 0.683
PF3 Phosphorus trifluoride 2 A1 487 397 -90 1.227
PF3 Phosphorus trifluoride 4 E 344 282 -62 1.220
SiF4 Silicon tetrafluoride 2 E 268 217 -51 1.233
BrF3 Bromine trifluoride 3 A1 242 191 -51 1.266
HSO3F Fluorosulfonic acid 7 A 562 457 -105 1.229
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
F2SO Thionyl Fluoride 3 A' 530 431 -99 1.231
F2SO Thionyl Fluoride 4 A' 378 285 -93 1.326
F2SO Thionyl Fluoride 6 A" 393 325 -68 1.208
BrF5 bromine pentafluoride 3 A1 369 294 -75 1.257
BrF5 bromine pentafluoride 6 B2 281 186 -95 1.513
BrF5 bromine pentafluoride 8 E 415 336 -79 1.233
ClF3 Chlorine trifluoride 3 A1 328 238 -90 1.377
ClF3 Chlorine trifluoride 6 B2 442 340 -102 1.298
N2O4 Dinitrogen tetroxide 9 B2u 265 185 -80 1.434
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
C3 carbon trimer 3 Πu 63 -152 -215 -0.417
SiH- silicon monohydride anion 1 Σ 2175 1761 -414 1.235
PCl5 Phosphorus pentachloride 2 A1' 370 267 -103 1.385
PCl5 Phosphorus pentachloride 7 E' 100 76 -24 1.317
F3PO Phosphoryl fluoride 5 E 482 391 -91 1.234
F3PO Phosphoryl fluoride 6 E 336 271 -65 1.242
SF5Cl sulfur chloropentafluoride 5 B1 625 414 -211 1.509
SF5Cl sulfur chloropentafluoride 7 B2 505 287 -218 1.760
SF5Cl sulfur chloropentafluoride 11 E 397 227 -170 1.752
GeF2 Germanium difluoride 2 A1 263 214 -49 1.231
H2OH2O water dimer 8 A' 103 164 61 0.629
H2OH2O water dimer 11 A" 108 163 55 0.661
H2OH2O water dimer 12 A" 88 130 42 0.677
ClOO chloroperoxy radical 3 A' 201 292 91 0.689
B2H6 Diborane 14 B2u 368 298 -70 1.234
GeH2 germylene 1 A1 1856 899 -957 2.064
GeH2 germylene 2 A1 916 1797 881 0.510
Mg2 Magnesium diatomic 1 Σg 51 104 53 0.493
Mg2 Magnesium diatomic 1 Σg 51 104 53 0.493
Mg2 Magnesium diatomic 1 Σg 51 104 53 0.493
Mg2 Magnesium diatomic 1 Σg 51 104 53 0.493
H2POH Phosphinous acid 9 A" 375 220 -155 1.703