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

Compare vibrational frequencies in CCCBDB for CH2CCl2 (Ethene, 1,1-dichloro-)

BLYP/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3091 56 A1 3035  
2 A1 1626 -1 A1 1627  
3 A1 1416 16 A1 1400  
4 A1 506 -97 A1 603  
5 A1 252 -47 A1 299  
6 A2 673 -13 A2 686  
7 B1 893 18 B1 875  
8 B1 411 -49 B1 460  
9 B2 3177 47 B2 3130  
10 B2 1077 -18 B2 1095  
11 B2 656 -144 B2 800  
12 B2 351 -21 B2 372  
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.