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III.G.7. (XIII.B.3.) (XIII.D.5.)

Compare vibrational frequencies for two calculations for O3 (Ozone)

A = HF/6-31G*

B = MP2/6-31G*

scale factors=0.8985, 0.943
  symmetry   frequency (cm-1)   reduced mass (amu)   IR Intensity (km mol-1)
mode number A B   A B diff. ratio   A B diff. ratio   A B diff. ratio
1 A1 A1   1382 1106 275.3 1.249   15.995 15.995 0.000 1.000   0.30 1.47 -1.18 0.202
2 A1 A1   763 686 77.4 1.113   15.995 15.995 0.000 1.000   12.04 7.78 4.26 1.547
3 B2 B2   1307 2244 -937.0 0.582   15.995 15.995 0.000 1.000   786.18 1482.27 -696.09 0.530
scaled by     0.8985 0.943

See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.