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

Compare vibrational frequencies for two calculations for O3- (Ozone anion)

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   1097 1290 -193.1 0.850   15.995 15.995 0.000 1.000   2.14 5.88 -3.74 0.364
2 A1 A1   599 630 -30.9 0.951   15.995 15.995 0.000 1.000   8.69 7.52 1.17 1.155
3 B2 B2   832i 103i -728.7 8.054   15.995 15.995 0.000 1.000   3110.40 13404.65 -10294.25 0.232
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.