National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 17bSeptember 2015
NIST Standard Reference Database 101
IIntroduction
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
IXFeedback
XOlder CCCBDB versions
XIIGeometries
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers
XXIOddities

NIST policy on privacy, security, and accessibility.

Please rate our products
© 2013 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.

Please send questions, comments, corrections, additions and suggestions to cccbdb@nist.gov.

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 CCSD(T)=FULL/6-31G*
Calculated values were scaled by 0.9707.

Species Name mode Symmetry Experiment Theory difference ratio
CH3SeH Methane selenol 12 A" 145 211 66 0.688
CH3OH Methyl alcohol 12 A" 200 339 139 0.591
C6H6 Benzene 8 B2g 703 540 -163 1.302
C2H2 Acetylene 4 Πg 612 348 -264 1.760
CHONH2 formamide 12 A" 289 -191 -479 -1.514
CBr2F2 Methane, dibromodifluoro- 3 A1 140 327 187 0.429
CHCCH2CH3 1-Butyne 22 A" 630 505 -125 1.248
C4H2 Diacetylene 7 Πg 482 276 -206 1.746
C4H2 Diacetylene 8 Πu 630 447 -183 1.410
C3H6O Oxetane 18 B1 90 -69 -159 -1.305
HCNO fulminic acid 5 Π 224 -226 -450 -0.991
HCCCl Chloroacetylene 5 Π 326 204 -122 1.595
COBr2 Carbonic dibromide 4 B1 757 501 -256 1.512
COBr2 Carbonic dibromide 6 B2 512 333 -179 1.536
C5H8O Methyl cyclopropyl ketone 4 A' 2970 1735 -1235 1.711
C5H8O Methyl cyclopropyl ketone 5 A' 2929 1468 -1461 1.995
C5H8O Methyl cyclopropyl ketone 9 A' 1386 1066 -320 1.300
C5H8O Methyl cyclopropyl ketone 10 A' 1352 970 -382 1.394
C5H8O Methyl cyclopropyl ketone 11 A' 1201 915 -286 1.312
C5H8O Methyl cyclopropyl ketone 12 A' 1170 744 -426 1.573
C5H8O Methyl cyclopropyl ketone 13 A' 1096 365 -731 3.003
C5H8O Methyl cyclopropyl ketone 30 A" 1028 3067 2039 0.335
C5H8O Methyl cyclopropyl ketone 31 A" 865 1448 583 0.597
C5H8O Methyl cyclopropyl ketone 32 A" 822 1199 377 0.686
C5H8O Methyl cyclopropyl ketone 33 A" 601 1042 441 0.577
C5H8O Methyl cyclopropyl ketone 34 A" 265 589 324 0.450
GeO2 Germanium dioxide 3 Πu 196 120 -75 1.629
C5H8 1,3-Pentadiene, (Z)- 22 A' 144 221 77 0.652
C5H8 1,3-Pentadiene, (Z)- 31 A" 456 335 -121 1.362
C5H8 1,3-Pentadiene, (Z)- 32 A" 171 115 -56 1.483
C2H Ethynyl radical 3 Π 372 297 -74 1.249
CH3 Methyl radical 2 A2" 606 421 -185 1.439
CH2OH Hydroxymethyl radical 8 A 482 719 237 0.671
CH2OH Hydroxymethyl radical 9 A 234 437 203 0.535
CHCl2 dichloromethyl radical 4 A' 190 302 112 0.628
C2Cl2+ dichloroacetylene cation 5 Πu 233 170 -63 1.369
AsH3+ Arsine cation 2 A1 452 655 203 0.690
N2O Nitrous oxide 3 Π 596 402 -194 1.482
NCl3 nitrogen trichloride 4 E 257 621 364 0.414
C3 carbon trimer 3 Πu 63 98 35 0.644
SiH- silicon monohydride anion 1 Σ 2175 1759 -416 1.236
SF5Cl sulfur chloropentafluoride 5 B1 625 459 -166 1.361
SF5Cl sulfur chloropentafluoride 7 B2 505 314 -191 1.611
SF5Cl sulfur chloropentafluoride 11 E 397 246 -151 1.615
Cl3- trichloride anion 2 Σu 327 264 -63 1.238
H2OH2O water dimer 11 A" 108 158 50 0.684
H2POH Phosphinous acid 9 A" 375 252 -124 1.491
Mg2 Magnesium diatomic 1 Σg 51 18 -33 2.883
CH3BO Borane, methyloxo- 7 E 897 1466 569 0.612