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Compare vibrational frequencies in CCCBDB for C3O2 (Carbon suboxide)

PBEPBE/6-31+G**

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 2197 2172   -24 Σg   2196  
2 Σg 764 755   -31 Σg   786  
3 Σu 2374 2347   89 Σu   2258  
4 Σu 1589 1571   -2 Σu   1573  
5 Πg 567 560   -13 Πg   573  
6 Πu 670 662   112 Πu   550  
7 Πu 166 164   103 Πu   61  
The calculated vibrational frequencies were scaled by 0.9886

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.