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

Compare vibrational frequencies for two calculations for HCS- (Thioformyl 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 A' A'   862 909 -46.2 0.949   9.648 10.882 -1.234 0.887   62.18 19.33 42.85 3.216
2 A' A'   1141 1152 -10.8 0.991   1.137 1.122 0.015 1.014   0.06 0.92 -0.86 0.069
3 A' A'   2607 2556 51.8 1.020   1.086 1.088 -0.001 0.999   424.47 449.77 -25.29 0.944
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.