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

Compare vibrational frequencies in CCCBDB for CH3 (Methyl radical)

CCSD(T)/aug-cc-pVDZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1' 3045 40 A1' 3004  
2 A2" 489 -117 A2" 606  
3 E' 3230 70 E' 3161  
4 E' 1380 -16 E' 1396  
The calculated vibrational frequencies were scaled by 0.9817

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.