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

Compare vibrational frequencies in CCCBDB for C2H4O (Ethylene oxide)

BLYP/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3030 24 A1 3006  
2 A1 1505 7 A1 1498  
3 A1 1215 -56 A1 1271  
4 A1 1085 -35 A1 1120  
5 A1 785 -92 A1 877  
6 A2 3105 42 A2 3063  
7 A2 1160 -140 A2 1300  
8 A2 962 102 A2 860  
9 B1 3124 59 B1 3065  
10 B1 1070 -72 B1 1142  
11 B1 801 -21 B1 822  
12 B2 3022 16 B2 3006  
13 B2 1490 18 B2 1472  
14 B2 1096 -55 B2 1151  
15 B2 691 -201 B2 892  
The calculated vibrational frequencies were scaled by 0.9924

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.