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

Compare vibrational frequencies in CCCBDB for C4 (Carbon tetramer)

ROHF/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 2144 87 Σg+ 2057  
2 Σg 924        
3 Σu 1361 -187 Σu 1549  
4 Πg 500 177 Πg 323  
5 Πu 188 28 Πu 160  
The calculated vibrational frequencies were scaled by 0.907

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.