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

Compare vibrational frequencies in CCCBDB for N2H2 (trans-diazine)

MP2/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3174 46 Ag 3128  
2 Ag 1528 -55 Ag 1583  
3 Ag 1256 -273 Ag 1529  
4 Au 1256 -33 Au 1289  
5 Bu 3208 88 Bu 3120  
6 Bu 1232 -85 Bu 1316  
The calculated vibrational frequencies were scaled by 0.9663

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.