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IV.C.1. (XIII.D.1.)

Compare vibrational frequencies in CCCBDB for CH2NN (diazomethane)

MP2/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3088 15 A1 3073  
2 A1 2266 165 A1 2101  
3 A1 1383 -32 A1 1415  
4 A1 1116 -59 A1 1175  
5 B1 536 -29 B1 565 B1 and B2 switched
6 B1 127i -533 B1 406 B1 and B2 switched
7 B2 3215 65 B2 3150 B1 and B2 switched
8 B2 1072 -38 B2 1110 B1 and B2 switched
9 B2 423 3 B2 420 B1 and B2 switched
The calculated vibrational frequencies were scaled by 0.943

See section XIII.C.3 List or set vibrational scaling factors to change the scale factors used here.
See section III.B.3.c Calculate a vibrational scaling factor for a set of molecules to determine the least squares best scaling factor.
See section III.B.3.b List of vibrational scaling factors and their uncertainties for information on where the above scaling factor is from.