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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 AM1
Calculated values were scaled by 0.9535.

Species Name mode Symmetry Experiment Theory difference ratio
CH3COCl Acetyl Chloride 15 A" 166 77 -89 2.145
CF3Br Bromotrifluoromethane 2 A1 760 630 -130 1.207
CF3Br Bromotrifluoromethane 5 E 547 450 -97 1.215
C5H11N Piperidine 24 A' 404 293 -111 1.379
C5H11N Piperidine 25 A' 246 188 -58 1.308
C5H11N Piperidine 45 A" 254 185 -69 1.376
NH2CN cyanamide 5 A' 408 730 322 0.559
C4H6O2 2,3-Butanedione 16 Au 48 -45 -93 -1.070
C4H6O2 2,3-Butanedione 21 Bg 240 50 -190 4.842
Zn(CH3)2 dimethyl zinc 10 E' 704 585 -119 1.203
Zn(CH3)2 dimethyl zinc 11 E' 134 106 -28 1.266
Zn(CH3)2 dimethyl zinc 14 E" 620 505 -115 1.229
CH2CHOH ethenol 5 A' 1663 3058 1395 0.544
CH2CHOH ethenol 6 A' 1412 3038 1626 0.465
CH2CHOH ethenol 7 A' 1300 1781 481 0.730
CH2CHOH ethenol 11 A' 486 1223 737 0.397
HCCCN Cyanoacetylene 7 Π 222 325 103 0.684
C2H+ Ethynyl cation 3 Π 550 794 244 0.692
CF2 Difluoromethylene 2 A1 667 533 -134 1.251
CH2 Methylene 2 A1 963 698 -265 1.380
CH2+ methylene cation 2 A1 968 376 -593 2.577
CCl3 Trichloromethyl radical 2 A1 251 133 -118 1.883
SeS- selenium monosulfide anion 1 Σ 469 3 -466 181.611
C2Cl2+ dichloroacetylene cation 4 Πg 318 494 176 0.644
BF3+ boron trifluoride cation 3 E' 1662 1097 -565 1.515
BF3+ boron trifluoride cation 4 E' 411 -286 -697 -1.436
HCl+ hydrogen chloride cation 1 Σ 2674 2088 -586 1.281
NaBr Sodium Bromide 1 Σ 302 197 -105 1.531
HF+ hydrogen fluoride cation 1 Σ 2913 3609 696 0.807
H2O+ water cation 3 B2 3259 2858 -401 1.140
H2S+ Hydrogen sulfide cation 1 A1 2496 1755 -741 1.422
H2Se+ Hydrogen selenide cation 1 A1 2267 312 -1955 7.273
H2Se+ Hydrogen selenide cation 2 A1 1017 -58 -1075 -17.527
BrF5 bromine pentafluoride 3 A1 369 170 -199 2.173
BrF5 bromine pentafluoride 4 B1 312 223 -89 1.398
BrF5 bromine pentafluoride 6 B2 281 85 -196 3.298
BrF5 bromine pentafluoride 8 E 415 249 -166 1.669
BrF5 bromine pentafluoride 9 E 237 145 -92 1.632
NCl3 nitrogen trichloride 3 E 642 939 297 0.684
HBr+ hydrogen bromide cation 1 Σ 2442 1990 -452 1.227
NO- nitric oxide anion 1 Σ 1363 2059 696 0.662
C5H5- cylopentadienyl anion 2 A1' 983 1407 424 0.699
SiH3+ silyl cation 4 E' 938 752 -187 1.248
SO+ sulfur monoxide cation 1 Σ 1360 1123 -237 1.212
H3O+ hydronium 3 E 3536 2906 -630 1.217
ZnH2 Zinc hydride 3 Πu 633 464 -169 1.364
MgH+ magnesium monohydride cation 1 Σ 1699 183 -1516 9.290
SiCl3 trichlorosilyl radical 1 A1 470 354 -116 1.327
SiCl3 trichlorosilyl radical 3 E 582 477 -105 1.219
HNB hydrogen nitrogen boron 3 Π 433 174 -259 2.487
ZnCH3 Zinc monomethyl 6 E 315 458 143 0.688
H2Cl+ dihydrogen monochloride cation 1 A1 2643 2204 -439 1.199
CH2SiH2 silaethylene 5 A1 927 771 -156 1.203
ZnCH2 Zinc methylene 6 B2 544 406 -138 1.339