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IV.C.1. (XIII.D.1.)

Compare vibrational frequencies in CCCBDB for HCNO (fulminic acid)

CISD/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σ 3358 22 Σ 3336  
2 Σ 2112 -83 Σ 2196  
3 Σ 937 -317 Σ 1254  
4 Π 579 42 Π 537  
5 Π 486 262 Π 224  
The calculated vibrational frequencies were scaled by 0.939

See section XIII.C.3 List or set vibrational scaling factors to change the scale factors used here.
See section III.B.3.c Calculate a vibrational scaling factor for a set of molecules to determine the least squares best scaling factor.
See section III.B.3.b List of vibrational scaling factors and their uncertainties for information on where the above scaling factor is from.