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

Compare vibrational frequencies in CCCBDB for HCN+ (hydrogen cyanide cation)

HSEh1PBE/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σ 3099 49 Σ 3050  
2 Σ 3099 1299 Σ 1800  
3 Σ 1856 1096 Π 760  
4 Σ 1856 1096 Π 760  
5 Π 736        
6 Π 462        
The calculated vibrational frequencies were scaled by 0.951

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.