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Compare vibrational frequencies in CCCBDB for HCNO (fulminic acid)

B3LYP/3-21G

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 3548 3424   87 Σ   3336  
2 Σ 2257 2177   -18 Σ   2196  
3 Σ 1107 1068   -186 Σ   1254  
4 Π 609 588   51 Π   537  
5 Π 545 526   302 Π   224  
The calculated vibrational frequencies were scaled by 0.9649

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.