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

Compare vibrational frequencies for two calculations for ZnCH2 (Zinc methylene)

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 A1 A1   2924 3009 -85.2 0.972   1.052 1.052 -0.000 1.000   58.72 19.66 39.07 2.988
2 A1 A1   1334 1356 -21.7 0.984   1.106 1.115 -0.009 0.992   30.53 12.44 18.09 2.455
3 A1 A1   489 555 -65.9 0.881   5.647 5.414 0.233 1.043   25.20 27.17 -1.97 0.927
4 B1 B1   578 641 -63.6 0.901   1.268 1.273 -0.004 0.997   80.38 86.72 -6.34 0.927
5 B2 B2   3000 3103 -103.0 0.967   1.110 1.111 -0.001 0.999   24.38 8.51 15.87 2.866
6 B2 B2   521 563 -42.4 0.925   1.167 1.173 -0.005 0.995   2.62 2.19 0.42 1.192
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.