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

Compare vibrational frequencies in CCCBDB for CH3CCH (propyne)

MP2/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3342 8 A1 3334  
2 A1 2942 24 A1 2918  
3 A1 1994 -130 A1 2124  
4 A1 1418 36 A1 1382  
5 A1 879 -52 A1 931  
6 E 3038 30 E 3008  
7 E 1462 10 E 1452  
8 E 1043 -10 E 1053  
9 E 623 -10 E 633  
10 E 229 -99 E 328  
The calculated vibrational frequencies were scaled by 0.9663

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.