National Institute of Standards and Technology
Computational Chemistry Comparison and Benchmark DataBase
Release 18October 2016
NIST Standard Reference Database 101
IIExperimental data
IIICalculated data
IVData comparisons
VCost comparisons
VIInput and output files
VIITutorials and Units
VIIILinks to other sites
XOlder CCCBDB versions
XIII Vibrations
XIVReaction data
XVEntropy data
XVIBibliographic data
XVIIIon data
XVIIIBad calculations
XIXIndex of properties
XXH-bond dimers

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

Compare vibrational frequencies in CCCBDB for C2F4 (Tetrafluoroethylene)


Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 1832 -40 Ag 1872  
2 Ag 765 -13 Ag 778  
3 Ag 374 -20 Ag 394  
4 Au 183 -7 Au 190  
5 B1u 1154 -32 B1u 1186  
6 B1u 522 -36 B1u 558  
7 B2g 414 -94 B2g 508  
8 B2u 1306 -31 B2u 1337  
9 B2u 189 -29 B2u 218  
10 B3g 1307 -33 B3g 1340  
11 B3g 518 -33 B3g 551  
12 B3u 394 -12 B3u 406  
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.