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

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

mPW1PW91/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3092 47 A' 3045  
2 A' 2967 -7 A' 2974  
3 A' 1655 258 A' 1397  
4 A' 1424 -10 A' 1434  
5 A' 1409 29 A' 1380  
6 A' 1357 226 A' 1131  
7 A' 1069 151 A' 918  
8 A' 910 253 A' 657  
9 A' 642 39 A' 603  
10 A' 460 -2620 A" 3080  
11 A" 3061 1478 A" 1583  
12 A" 1427 17 A" 1410  
13 A" 1093 -3 A" 1096  
14 A" 599 124 A" 475  
15 A" 9   A"   internal rotation, almost free rotor
The calculated vibrational frequencies were scaled by 0.9483

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.