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

Compare vibrational frequencies in CCCBDB for C4 (Carbon tetramer)

HF/CEP-121G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 2082 25 Σg+ 2057  
2 Σg 879        
3 Σu 1471 -77 Σu 1549  
4 Πg 481 158 Πg 323  
5 Πu 222 62 Πu 160  
The calculated vibrational frequencies were scaled by 0.9125

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.