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

Compare vibrational frequencies in CCCBDB for C2H5 (Ethyl radical)

MP2=FULL/6-311G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3043 10 A' 3033  
2 A' 2962 120 A' 2842  
3 A' 2881        
4 A' 1449        
5 A' 1434 -6 A' 1440  
6 A' 1371 5 A' 1366  
7 A' 1040 -98 A' 1138  
8 A' 960        
9 A' 431 -97 A' 528  
10 A" 3148 36 A" 3112  
11 A" 3006 19 A" 2987  
12 A" 1455 15 A" 1440  
13 A" 1167 -8 A" 1175  
14 A" 787        
15 A" 134        
The calculated vibrational frequencies were scaled by 0.9471

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.