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

Compare vibrational frequencies for two calculations for HNO (Nitrosyl hydride)

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'   3009 2835 174.2 1.061   1.075 1.078 -0.003 0.997   74.67 129.68 -55.01 0.576
2 A' A'   1770 1498 272.0 1.182   14.777 1.276 13.501 11.577   61.00 23.61 37.39 2.584
3 A' A'   1559 1401 158.8 1.113   1.164 6.592 -5.428 0.177   39.09 14.74 24.35 2.652
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.