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

Compare vibrational frequencies for two calculations for HNS- (HNS-)

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'   3190 3107 83.7 1.027   1.077 1.077 -0.000 1.000   81.20 131.16 -49.96 0.619
2 A' A'   1155 1196 -41.4 0.965   1.096 1.090 0.006 1.005   17.73 15.80 1.93 1.122
3 A' A'   696 821 -125.4 0.847   13.339 14.644 -1.305 0.911   17.00 38.05 -21.05 0.447
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.