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

Compare vibrational frequencies in CCCBDB for CH3OO (methylperoxy radical)

MP2/6-311G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3079 46 A' 3033  
2 A' 2957 3 A' 2954  
3 A' 1456 3 A' 1453  
4 A' 1422 14 A' 1408  
5 A' 1226 43 A' 1183  
6 A' 1163 46 A' 1117  
7 A' 923 21 A' 902  
8 A' 491 9 A' 482  
9 A" 3066 46 A" 3020  
10 A" 1444 3 A" 1441  
11 A" 1117        
12 A" 141 -29 A" 170  
The calculated vibrational frequencies were scaled by 0.9503

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.