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

Compare vibrational frequencies for two calculations for SF2- (sulfur difluoride 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'   710 638 71.8 1.113   22.547 23.346 -0.799 0.966   114.81 109.00 5.81 1.053
2 A' A'   339 380 -40.6 0.893   23.296 19.670 3.626 1.184   16.38 0.32 16.07 51.299
3 A' A'   182 279 -97.7 0.650   19.354 21.955 -2.601 0.882   5.46 183.92 -178.47 0.030
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.