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

Compare vibrational frequencies in CCCBDB for MgF2 (Magnesium fluoride)

mPW1PW91/6-31G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 560 20 Σg 540  
2 Σu 881 56 Σu 825  
3 Πu 133 -32 Πu 165  
The calculated vibrational frequencies were scaled by 0.9515

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.