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

Compare vibrational frequencies in CCCBDB for CH2 (Methylene)

CCSD(T)/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2779 -26 A1 2806  
2 A1 1104 141 A1 963  
3 B2 2856 -334 B2 3190  
The calculated vibrational frequencies were scaled by 0.9621

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.