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

Compare vibrational frequencies in CCCBDB for C4N2 (2-Butynedinitrile)

HF/cc-pV(T+d)Z

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 2441 151 Σg 2290  
2 Σg 2235 116 Σg 2119  
3 Σg 576 -116 Σg 692  
4 Σu 2381 140 Σu 2241  
5 Σu 1100 -54 Σu 1154  
6 Πg 587 83 Πg 504  
7 Πg 290 27 Πg 263  
8 Πu 511 39 Πu 472  
9 Πu 114 7 Πu 107  
The calculated vibrational frequencies were scaled by 0.9103

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.