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 C6H4 (Benzyne)

HF/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3105 11 A1 3094  
2 A1 3065 -6 A1 3071  
3 A1 1957 97 A1 1860  
4 A1 1432 17 A1 1415  
5 A1 1267 -4 A1 1271  
6 A1 1133 78 A1 1055  
7 A1 1000 -10 A1 1010  
8 A1 957 -25 A1 982  
9 A1 599 -1 A1 600  
10 A2 1003   A2    
11 A2 896   A2    
12 A2 576   A2    
13 A2 406   A2    
14 B1 967 129 B1 838  
15 B1 777 40 B1 737  
16 B1 391 3 B1 388  
17 B2 3100 14 B2 3086  
18 B2 3037 -12 B2 3049  
19 B2 1459 8 B2 1451  
20 B2 1377 -17 B2 1394  
21 B2 1228 -79 B2 1307  
22 B2 1083 -11 B2 1094  
23 B2 810 -39 B2 849  
24 B2 340 -132 B2 472  
The calculated vibrational frequencies were scaled by 0.9014

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.