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

Compare vibrational frequencies in CCCBDB for CH2CO (Ketene)

MP2/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3090 19 A1 3070  
2 A1 2021 -131 A1 2152  
3 A1 1410 22 A1 1388  
4 A1 1078 -40 A1 1118  
5 B1 662 74 B1 588  
6 B1 435 -93 B1 528  
7 B2 3186 20 B2 3166  
8 B2 1010 33 B2 977  
9 B2 396 -37 B2 433  
The calculated vibrational frequencies were scaled by 0.9568

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.