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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' 3059 26 A' 3033  
2 A' 2974 132 A' 2842  
3 A' 2906        
4 A' 1517        
5 A' 1486 46 A' 1440  
6 A' 1432 66 A' 1366  
7 A' 1015 -123 A' 1138  
8 A' 980        
9 A' 433 -95 A' 528  
10 A" 3162 50 A" 3112  
11 A" 3011 24 A" 2987  
12 A" 1527 87 A" 1440  
13 A" 1210 35 A" 1175  
14 A" 825        
15 A" 145        
The calculated vibrational frequencies were scaled by 0.9545

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.