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Compare vibrational frequencies in CCCBDB for CHBrCHBr (Ethene, 1,2-dibromo-, (Z)-)

B97D3/6-31G**

18 11 26 13 55
Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency Scaled
Frequency
Harm.
diff
Fund.
diff
Symmetry Harmonic
Frequency
Fundamental
Frequency
Comment
1 A1 3188 3188   128 A1   3060  
2 A1 1599 1599   15 A1   1584  
3 A1 1151 1151           
4 A1 567 567           
5 A1 112 112           
6 A2 843 843           
7 A2 370 370           
8 B1 666 666   -2413 B1   3079  
9 B2 3166 3166           
10 B2 1252 1252           
11 B2 738 738           
12 B2 462 462           
The calculated vibrational frequencies were scaled by 1

See section Calculated; Vibrations; Scale Factors; Set scaling factors to change the scale factors used here.
See section Calculated; Vibrations; Scale Factors; Calculate a scale factor to determine the least squares best scaling factor.
See section Calculated; Vibrations; Scale Factors; Scale factor uncertainty for information on where the above scaling factor is from.