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

Compare vibrational frequencies in CCCBDB for C3 (carbon trimer)

PBEPBE/cc-pVTZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 1236 12 Σg 1225  
2 A1 77 -1963 Σu 2040  
3 B2 2016 1952 Πu 63  
The calculated vibrational frequencies were scaled by 0.9931

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.