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

Compare vibrational frequencies in CCCBDB for C2H6 (Ethane)

PM3

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1   -2896 A1g 2896  
2   -1388 A1g 1388  
3   -995 A1g 995  
4   -289 A1u 289  
5   -2915 A2u 2915  
6   -1370 A2u 1370  
7   -2969 Eg 2969  
8   -1468 Eg 1468  
9   -1190 Eg 1190  
10   -2974 Eu 2974  
11   -1460 Eu 1460  
12   -822 Eu 822  
The calculated vibrational frequencies were scaled by 0.974

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.