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

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

HF/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3062 17 A' 3045  
2 A' 2943 -31 A' 2974  
3 A' 1486 89 A' 1397  
4 A' 1413 -21 A' 1434  
5 A' 1339 -41 A' 1380  
6 A' 1247 116 A' 1131  
7 A' 1040 122 A' 918  
8 A' 822 165 A' 657  
9 A' 595 -8 A' 603  
10 A' 422 -2658 A" 3080  
11 A" 3021 1438 A" 1583  
12 A" 1481 71 A" 1410  
13 A" 1128 32 A" 1096  
14 A" 555 80 A" 475  
15 A" 10   A"   internal rotation, almost free rotor
The calculated vibrational frequencies were scaled by 0.9026

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.