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Compare vibrational frequencies in CCCBDB for C3 (carbon trimer)

B3LYP/6-31G(2df,p)

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 Σg 1241 1198   -27 Σg   1225  
2 Σu 2158 2083   43 Σu   2040  
3 Πu 172 166   103 Πu   63  
The calculated vibrational frequencies were scaled by 0.965

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.