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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 3016 10 A1 3006  
2 A1 1521 54 A1 1467  
3 A1 1172 -95 A1 1267  
4 A1 1076 -70 A1 1146  
5 A1 787 -70 A1 857  
6 A2 3084 21 A2 3063  
7 A2 1154 104 A2 1050  
8 A2 947 -73 A2 1020  
9 B1 3104 39 B1 3065  
10 B1 1062 -84 B1 1146  
11 B1 808 11 B1 797  
12 B2 3007 1 B2 3006  
13 B2 1506 47 B2 1459  
14 B2 1070 -89 B2 1159  
15 B2 720 -104 B2 824  
The calculated vibrational frequencies were scaled by 0.9935

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.