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

Compare vibrational frequencies for two calculations for HCS (Thioformyl radical)

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'   3033 3009 23.6 1.008   1.089 1.108 -0.019 0.983   7.97 47.19 -39.22 0.169
2 A' A'   928 1515 -587.1 0.612   7.070 8.696 -1.626 0.813   0.90 295.82 -294.92 0.003
3 A' A'   887 845 41.6 1.049   1.234 1.183 0.051 1.043   26.42 148.41 -122.00 0.178
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.