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

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IV.C.1. (XIII.D.1.)

Compare vibrational frequencies in CCCBDB for C5H12 (Propane, 2,2-dimethyl-)

PBEPBE/6-31G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2937 28 A1 2909  
2 A1 1379 -2 A1 1381  
3 A1 714 -19 A1 733  
4 A2 248 50 A2 198  
5 E 3010 55 E 2955  
6 E 1438 -13 E 1451  
7 E 1049 50 E 999  
8 E 323 -12 E 335  
9 T1 3009 34 T1 2975  
10 T1 1429 -32 T1 1461  
11 T1 924 -8 T1 932  
12 T1 312 109 T1 203  
13 T2 3013 54 T2 2959  
14 T2 2930 54 T2 2876  
15 T2 1468 -7 T2 1475  
16 T2 1340 -32 T2 1372  
17 T2 1230 -26 T2 1256  
18 T2 908 -17 T2 925  
19 T2 405 -13 T2 418  
The calculated vibrational frequencies were scaled by 0.9863

See section XIII.C.3 List or set vibrational scaling factors to change the scale factors used here.
See section III.B.3.c Calculate a vibrational scaling factor for a set of molecules to determine the least squares best scaling factor.
See section III.B.3.b List of vibrational scaling factors and their uncertainties for information on where the above scaling factor is from.