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

Compare vibrational frequencies in CCCBDB for CH3NH2 (methyl amine)

MP2/CEP-121G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3389 28 A' 3361  
2 A' 2971 10 A' 2961  
3 A' 2858 38 A' 2820  
4 A' 1686 63 A' 1623  
5 A' 1484 11 A' 1473  
6 A' 1453 23 A' 1430  
7 A' 1139 9 A' 1130  
8 A' 1029 -15 A' 1044  
9 A' 728 -52 A' 780  
10 A" 3519 92 A" 3427  
11 A" 3023 38 A" 2985  
12 A" 1508 23 A" 1485  
13 A" 1325 -10 A" 1335  
14 A" 942   A"   1195 assignment questionable
15 A" 306 38 A" 268  
The calculated vibrational frequencies were scaled by 0.976

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.