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

Compare vibrational frequencies in CCCBDB for AlF2Cl (Aluminum chloride difluoride)

HF/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1   -820 A1 820  
2   -500 A1 500  
3   -250 A1 250  
4   -260 B1 260  
5   -900 B2 900  
6   -200 B2 200  
The calculated vibrational frequencies were scaled by 0.8165

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.