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

Compare vibrational frequencies in CCCBDB for C2H4O (Ethylene oxide)

PBEPBE/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2905 -101 A1 3006  
2 A1 1452 -15 A1 1467  
3 A1 1141 -126 A1 1267  
4 A1 1037 -109 A1 1146  
5 A1 784 -73 A1 857  
6 A2 2975 -88 A2 3063  
7 A2 1101 51 A2 1050  
8 A2 912 -108 A2 1020  
9 B1 2994 -71 B1 3065  
10 B1 1024 -122 B1 1146  
11 B1 776 -21 B1 797  
12 B2 2896 -110 B2 3006  
13 B2 1433 -26 B2 1459  
14 B2 1026 -133 B2 1159  
15 B2 726 -98 B2 824  
The calculated vibrational frequencies were scaled by 0.9535

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.