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Compare vibrational frequencies for two calculations for FClO (chlorosyl fluoride)


A = HF/6-31G*
B = MP2/6-31G*

scale factors=0.8985, 0.943 -0.272 0.139 0.140
  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'   906 1191 -284.9 0.761   19.231 19.503 0.986   69.72 47.63 1.464
2 A' A'   743 531 211.8 1.399   22.979 22.840 1.006   146.46 109.79 1.334
3 A' A'   327 278 49.3 1.177   19.285 19.145 1.007   19.02 12.42 1.531
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.