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

Compare vibrational frequencies in CCCBDB for C2H+ (Ethynyl cation)

B2PLYP/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σ 3040        
2 Σ 1894 62 Σ 1832 different numbering
3 Π 817 267 Π 550 different numbering
4 Π 817 267 Π 550 different numbering
The calculated vibrational frequencies were scaled by 0.9492

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.