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

Compare vibrational frequencies in CCCBDB for CH2CCH2 (allene)

MP2/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3037 22 A1 3015  
2 A1 1454 11 A1 1443  
3 A1 1018 -55 A1 1073  
4 B1 848 -17 B1 865  
5 B2 3038 31 B2 3007  
6 B2 1903 -54 B2 1957  
7 B2 1422 24 B2 1398  
8 E 3135 49 E 3086  
9 E 1001 2 E 999  
10 E 831 -10 E 841  
11 E 294 -61 E 355  
The calculated vibrational frequencies were scaled by 0.9663

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.