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

Compare vibrational frequencies in CCCBDB for CH3NH2 (methyl amine)

MP2=FULL/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3264 -97 A' 3361  
2 A' 2961 0 A' 2961  
3 A' 2857 37 A' 2820  
4 A' 1675 52 A' 1623  
5 A' 1521 48 A' 1473  
6 A' 1452 22 A' 1430  
7 A' 1143 13 A' 1130  
8 A' 988 -56 A' 1044  
9 A' 752 -28 A' 780  
10 A" 3359 -68 A" 3427  
11 A" 3002 17 A" 2985  
12 A" 1544 59 A" 1485  
13 A" 1326 -9 A" 1335  
14 A" 952   A"   1195 assignment questionable
15 A" 320 52 A" 268  
The calculated vibrational frequencies were scaled by 0.948

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.