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

Compare vibrational frequencies in CCCBDB for CH3CO (Acetyl radical)

MP2/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3030        
2 A' 2942        
3 A' 2393 518 A' 1875 matrix
4 A' 1484 64 A' 1420 matrix
5 A' 1374        
6 A' 1019        
7 A' 698        
8 A' 412        
9 A" 3031        
10 A" 1491        
11 A" 964        
12 A" 96        
The calculated vibrational frequencies were scaled by 0.9513

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.