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

Compare vibrational frequencies in CCCBDB for CH3CO (Acetyl radical)

MP4/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3033        
2 A' 2945        
3 A' 2484 609 A' 1875 matrix
4 A' 1489 69 A' 1420 matrix
5 A' 1372        
6 A' 1013        
7 A' 654        
8 A' 412        
9 A" 3032        
10 A" 1495        
11 A" 960        
12 A" 96        
The calculated vibrational frequencies were scaled by 0.9698

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.