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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' 2978 -55 A' 3033  
2 A' 2902 60 A' 2842  
3 A' 2840        
4 A' 1465        
5 A' 1445 5 A' 1440  
6 A' 1395 29 A' 1366  
7 A' 1000 -138 A' 1138  
8 A' 973        
9 A' 413 -115 A' 528  
10 A" 3066 -46 A" 3112  
11 A" 2932 -55 A" 2987  
12 A" 1469 29 A" 1440  
13 A" 1176 1 A" 1175  
14 A" 782        
15 A" 149        
The calculated vibrational frequencies were scaled by 0.8985

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.