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

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

HF/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 2176 69 Σg+ 2107  
2 Σg 474 -30 Σg+ 504  
3 Σu 989        
4 Πg 540 222 Πg 318  
5 Πg 517 199 Πg 318  
6 Πu 201 -32 Πu 233  
7 Πu 182 -51 Πu 233  
The calculated vibrational frequencies were scaled by 0.9026

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.