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

Compare vibrational frequencies in CCCBDB for CH3OO (methylperoxy radical)

HF/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3054 21 A' 3033  
2 A' 2934 -20 A' 2954  
3 A' 1475 22 A' 1453  
4 A' 1430 22 A' 1408  
5 A' 1171 -12 A' 1183  
6 A' 1038 -79 A' 1117  
7 A' 862 -40 A' 902  
8 A' 437 -45 A' 482  
9 A" 3034 14 A" 3020  
10 A" 1457 16 A" 1441  
11 A" 1132        
12 A" 140 -30 A" 170  
The calculated vibrational frequencies were scaled by 0.9014

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.