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

Compare vibrational frequencies in CCCBDB for C2H4+ (Ethylene cation)

HF/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3015        
2 A 1539 50 Ag 1488  
3 Ag 1240 -19 Ag 1259  
4 A 372 288 Au 84  
5 B1u 3007        
6 B1 1440        
7 B2g 1092 191 B3u 901  
8 B2 1092 -11 B2g 1103  
9 B2u 822        
10 B3 3112 2299 B2u 813  
11 B3g 1214 -1765 B1u 2979  
12 B3 983 -428 B1u 1412  
The calculated vibrational frequencies were scaled by 0.8985

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.