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

Compare vibrational frequencies in CCCBDB for C2H5 (Ethyl radical)

HF/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 2981 -52 A' 3033  
2 A' 2903 61 A' 2842  
3 A' 2839        
4 A' 1484        
5 A' 1448 8 A' 1440  
6 A' 1425 59 A' 1366  
7 A' 1012 -126 A' 1138  
8 A' 995        
9 A' 420 -108 A' 528  
10 A" 3077 -35 A" 3112  
11 A" 2936 -51 A" 2987  
12 A" 1489 49 A" 1440  
13 A" 1195 20 A" 1175  
14 A" 809        
15 A" 108        
The calculated vibrational frequencies were scaled by 0.9029

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.