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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 3045 -28 A1 3073  
2 A1 1901 -200 A1 2101  
3 A1 1437 22 A1 1415  
4 A1 1166 -9 A1 1175  
5 B1 714 149 B1 565 B1 and B2 switched
6 B1 582 176 B1 406 B1 and B2 switched
7 B2 3158 8 B2 3150 B1 and B2 switched
8 B2 1156 46 B2 1110 B1 and B2 switched
9 B2 413 -7 B2 420 B1 and B2 switched
The calculated vibrational frequencies were scaled by 0.9056

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.