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

Compare vibrational frequencies in CCCBDB for ZnCH3 (Zinc monomethyl)

PBEPBE/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2947        
2 A1 1285 221 A1 1064  
3 A1 660 215 A1 445  
4 E 3017        
5 E 1421        
6 E 651 336 E 315 Tentative
The calculated vibrational frequencies were scaled by 0.9909

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.