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

Compare vibrational frequencies in CCCBDB for CH2NN (diazomethane)

HF/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3034 -39 A1 3073  
2 A1 1894 -207 A1 2101  
3 A1 1432 17 A1 1415  
4 A1 1163 -12 A1 1175  
5 B1 712 147 B1 565 B1 and B2 switched
6 B1 580 174 B1 406 B1 and B2 switched
7 B2 3147 -3 B2 3150 B1 and B2 switched
8 B2 1153 43 B2 1110 B1 and B2 switched
9 B2 411 -9 B2 420 B1 and B2 switched
The calculated vibrational frequencies were scaled by 0.9026

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.