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

Compare vibrational frequencies in CCCBDB for C2Cl2+ (dichloroacetylene cation)

CISD/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 2131 24 Σg+ 2107  
2 Σg 428 -76 Σg+ 504  
3 Σu 909        
4 Πg 579 261 Πg 318  
5 Πg 569 252 Πg 318  
6 Πu 196 -37 Πu 233  
7 Πu 184 -49 Πu 233  
The calculated vibrational frequencies were scaled by 0.939

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.