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

Compare vibrational frequencies in CCCBDB for C2H2 (Acetylene)

DREIDING

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1   -3374 Σg 3374  
2   -1974 Σg 1974  
3   -3289 Σu 3289  
4   -612 Πg 612  
5   -730 Πu 730  
The calculated vibrational frequencies were scaled by 0.936

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.