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

Compare vibrational frequencies in CCCBDB for C2H4O (Ethylene oxide)

MP2/LANL2DZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3033 27 A1 3006  
2 A1 1485 18 A1 1467  
3 A1 1196 -71 A1 1267  
4 A1 1098 -48 A1 1146  
5 A1 756 -101 A1 857  
6 A2 3134 71 A2 3063  
7 A2 1166 116 A2 1050  
8 A2 952 -68 A2 1020  
9 B1 3151 86 B1 3065  
10 B1 1048 -98 B1 1146  
11 B1 804 7 B1 797  
12 B2 3022 16 B2 3006  
13 B2 1471 12 B2 1459  
14 B2 1082 -77 B2 1159  
15 B2 665 -159 B2 824  
The calculated vibrational frequencies were scaled by 0.9631

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.