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

Compare vibrational frequencies in CCCBDB for CH3NO2 (Methane, nitro-)

HF/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3094 49 A' 3045  
2 A' 2961 -13 A' 2974  
3 A' 1478 81 A' 1397  
4 A' 1429 -5 A' 1434  
5 A' 1424 44 A' 1380  
6 A' 1365 234 A' 1131  
7 A' 1087 169 A' 918  
8 A' 874 217 A' 657  
9 A' 610 7 A' 603  
10 A' 448 -2632 A" 3080  
11 A" 3065 1482 A" 1583  
12 A" 1455 45 A" 1410  
13 A" 1144 48 A" 1096  
14 A" 575 100 A" 475  
15 A" 23   A"   internal rotation, almost free rotor
The calculated vibrational frequencies were scaled by 0.9014

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.