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Compare vibrational frequencies in CCCBDB for C2N2 (Cyanogen)

PBEPBE/3-21G*

18 11 26 13 55
Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency Scaled
Frequency
Harm.
diff
Fund.
diff
Symmetry Harmonic
Frequency
Fundamental
Frequency
Comment
1 Σg 2340 2231   -99 Σg   2330  
2 Σg 878 837   -9 Σg   846  
3 Σu 2150 2050   -108 Σu   2158  
4 Πg 788 752   249 Πg   503  
5 Πu 313 298   64 Πu   234  
The calculated vibrational frequencies were scaled by 0.9535

See section Calculated; Vibrations; Scale Factors; Set scaling factors to change the scale factors used here.
See section Calculated; Vibrations; Scale Factors; Calculate a scale factor to determine the least squares best scaling factor.
See section Calculated; Vibrations; Scale Factors; Scale factor uncertainty for information on where the above scaling factor is from.