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

Compare vibrational frequencies in CCCBDB for CH3NH2 (methyl amine)

HF/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3436 75 A' 3361  
2 A' 2918 -43 A' 2961  
3 A' 2830 10 A' 2820  
4 A' 1670 47 A' 1623  
5 A' 1501 28 A' 1473  
6 A' 1466 36 A' 1430  
7 A' 1141 11 A' 1130  
8 A' 1046 2 A' 1044  
9 A' 575 -205 A' 780  
10 A" 3543 116 A" 3427  
11 A" 2955 -30 A" 2985  
12 A" 1519 34 A" 1485  
13 A" 1311 -24 A" 1335  
14 A" 944   A"   1195 assignment questionable
15 A" 250 -18 A" 268  
The calculated vibrational frequencies were scaled by 0.9029

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.