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 C4H6O2 (2,3-Butanedione)

HF/6-31+G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 2995 -23 Ag 3018  
2 Ag 2899 -31 Ag 2930  
3 Ag 1828 109 Ag 1719  
4 Ag 1430 6 Ag 1424  
5 Ag 1396 30 Ag 1366  
6 Ag 1282 8 Ag 1274  
7 Ag 1005 1 Ag 1004  
8 Ag 678 -7 Ag 685  
9 Ag 518 -96 Ag 614  
10 Ag 350 -19 Ag 369  
11 Au 2959 -31 Au 2990  
12 Au 1435 14 Au 1421  
13 Au 962 -149 Au 1111  
14 Au 355 16 Au 339  
15 Au 117        
16 Au 42 -6 Au 48  
17 Bg 2959 -19 Bg 2978  
18 Bg 1438 14 Bg 1424  
19 Bg 1063 -46 Bg 1109  
20 Bg 612 74 Bg 538  
21 Bg 117 -123 Bg 240  
22 Bu 2995 -16 Bu 3011  
23 Bu 2898 -28 Bu 2926  
24 Bu 1803 85 Bu 1718  
25 Bu 1430 9 Bu 1421  
26 Bu 1384 31 Bu 1353  
27 Bu 1113 2 Bu 1111  
28 Bu 898 -29 Bu 927  
29 Bu 532 -2 Bu 534  
30 Bu 230 -20 Bu 250  
The calculated vibrational frequencies were scaled by 0.9042

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.