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

Compare vibrational frequencies in CCCBDB for C2H5 (Ethyl radical)

QCISD/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3031 -2 A' 3033  
2 A' 2950 108 A' 2842  
3 A' 2882        
4 A' 1514        
5 A' 1475 35 A' 1440  
6 A' 1431 65 A' 1366  
7 A' 1014 -124 A' 1138  
8 A' 970        
9 A' 434 -94 A' 528  
10 A" 3129 17 A" 3112  
11 A" 2985 -2 A" 2987  
12 A" 1524 84 A" 1440  
13 A" 1204 29 A" 1175  
14 A" 822        
15 A" 133        
The calculated vibrational frequencies were scaled by 0.9692

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.