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

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

BLYP/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3071 1 A1 3070  
2 A1 1604 -124 A1 1728  
3 A1 1381 21 A1 1360  
4 A1 853 -73 A1 926  
5 A1 439 -111 A1 550  
6 A2 624 -90 A2 714  
7 B1 674 -129 B1 803 B1 & B2 switched in 1974sve/kov
8 B1 513 -98 B1 611  
9 B2 3216 62 B2 3154  
10 B2 1295 -7 B2 1302  
11 B2 907 -48 B2 955  
12 B2 373 -65 B2 438  
The calculated vibrational frequencies were scaled by 0.9252

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.