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

Compare vibrational frequencies in CCCBDB for CCl2O (Phosgene)

PM3

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1   -1827 A1 1827  
2   -567 A1 567  
3   -285 A1 285  
4   -580 B1 580  
5   -849 B2 849  
6   -440 B2 440  
The calculated vibrational frequencies were scaled by 0.974

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.