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

Compare vibrational frequencies in CCCBDB for CH2CF2 (Ethene, 1,1-difluoro-)

MP2/CEP-121G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3086 16 A1 3070  
2 A1 1639 -89 A1 1728  
3 A1 1400 40 A1 1360  
4 A1 799 -127 A1 926  
5 A1 461 -89 A1 550  
6 A2 697 -17 A2 714  
7 B1 792 -11 B1 803 B1 & B2 switched in 1974sve/kov
8 B1 503 -108 B1 611  
9 B2 3211 57 B2 3154  
10 B2 1191 -111 B2 1302  
11 B2 912 -43 B2 955  
12 B2 393 -45 B2 438  
The calculated vibrational frequencies were scaled by 0.976

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.