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

Compare vibrational frequencies in CCCBDB for C2H4O (Ethylene oxide)

BLYP/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3019 13 A1 3006  
2 A1 1523 56 A1 1467  
3 A1 1173 -94 A1 1267  
4 A1 1077 -69 A1 1146  
5 A1 788 -69 A1 857  
6 A2 3087 24 A2 3063  
7 A2 1155 105 A2 1050  
8 A2 948 -72 A2 1020  
9 B1 3107 42 B1 3065  
10 B1 1063 -83 B1 1146  
11 B1 809 12 B1 797  
12 B2 3010 4 B2 3006  
13 B2 1507 48 B2 1459  
14 B2 1071 -88 B2 1159  
15 B2 721 -103 B2 824  
The calculated vibrational frequencies were scaled by 0.9945

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.