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

Compare vibrational frequencies in CCCBDB for C2H4O (Ethylene oxide)

MP2/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3042 36 A1 3006  
2 A1 1514 47 A1 1467  
3 A1 1214 -53 A1 1267  
4 A1 1105 -41 A1 1146  
5 A1 769 -88 A1 857  
6 A2 3125 62 A2 3063  
7 A2 1178 128 A2 1050  
8 A2 968 -52 A2 1020  
9 B1 3142 77 B1 3065  
10 B1 1064 -82 B1 1146  
11 B1 815 18 B1 797  
12 B2 3031 25 B2 3006  
13 B2 1499 40 B2 1459  
14 B2 1116 -43 B2 1159  
15 B2 680 -144 B2 824  
The calculated vibrational frequencies were scaled by 0.9568

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.