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

Compare vibrational frequencies in CCCBDB for CH3CO (Acetyl radical)

MP2/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3034        
2 A' 2935        
3 A' 2422 547 A' 1875 matrix
4 A' 1466 46 A' 1420 matrix
5 A' 1383        
6 A' 1036        
7 A' 802        
8 A' 439        
9 A" 3039        
10 A" 1470        
11 A" 965        
12 A" 62        
The calculated vibrational frequencies were scaled by 0.9568

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.