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

Compare vibrational frequencies in CCCBDB for CH2NN (diazomethane)

MP2=FULL/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3100 27 A1 3073  
2 A1 2138 37 A1 2101  
3 A1 1411 -4 A1 1415  
4 A1 1029 -146 A1 1175  
5 B1 511 -54 B1 565 B1 and B2 switched
6 B1 253 -153 B1 406 B1 and B2 switched
7 B2 3227 77 B2 3150 B1 and B2 switched
8 B2 1112 2 B2 1110 B1 and B2 switched
9 B2 417 -3 B2 420 B1 and B2 switched
The calculated vibrational frequencies were scaled by 0.9548

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.