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

Compare vibrational frequencies in CCCBDB for C2H5 (Ethyl radical)

ROHF/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
14 A' 2997 -36 A' 3033  
12 A' 2925 83 A' 2842  
11 A' 2873        
9 A' 1508        
8 A' 1458 18 A' 1440  
7 A' 1431 65 A' 1366  
5 A' 1011 -127 A' 1138  
4 A' 952        
2 A' 432 -96 A' 528  
15 A" 3091 -21 A" 3112  
13 A" 2951 -36 A" 2987  
10 A" 1511 71 A" 1440  
6 A" 1204 29 A" 1175  
3 A" 814        
1 A" 153        
The calculated vibrational frequencies were scaled by 0.907

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.