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Compare vibrational frequencies in CCCBDB for C3O (Tricarbon monoxide)

B1B95/6-31G*

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 Σ 2386 2265   8 Σ   2257  
2 Σ 2003 1901   -6 Σ   1907  
3 Σ 981 931   -4 Σ   935  
4 Π 615 584   3 Π   581  
5 Π 181 172   63 Π   109  
The calculated vibrational frequencies were scaled by 0.9493

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.