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

Compare vibrational frequencies in CCCBDB for C2H5 (Ethyl radical)

MP2/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3048 15 A' 3033  
2 A' 2964 122 A' 2842  
3 A' 2896        
4 A' 1512        
5 A' 1481 41 A' 1440  
6 A' 1427 61 A' 1366  
7 A' 1012 -126 A' 1138  
8 A' 977        
9 A' 432 -96 A' 528  
10 A" 3151 39 A" 3112  
11 A" 3001 14 A" 2987  
12 A" 1521 81 A" 1440  
13 A" 1206 31 A" 1175  
14 A" 822        
15 A" 144        
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.