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

Compare vibrational frequencies in CCCBDB for C2H5 (Ethyl radical)

MP2/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3058 25 A' 3033  
2 A' 2972 130 A' 2842  
3 A' 2892        
4 A' 1464        
5 A' 1450 10 A' 1440  
6 A' 1386 20 A' 1366  
7 A' 1045 -93 A' 1138  
8 A' 971        
9 A' 437 -91 A' 528  
10 A" 3160 48 A" 3112  
11 A" 3015 28 A" 2987  
12 A" 1469 29 A" 1440  
13 A" 1177 2 A" 1175  
14 A" 792        
15 A" 153        
The calculated vibrational frequencies were scaled by 0.943

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.