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

Compare vibrational frequencies in CCCBDB for N2O4 (Dinitrogen tetroxide)

MP2/CEP-121G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 1250 -133 Ag 1383  
2 Ag 702 -105 Ag 807  
3 Ag 186 -79 Ag 265  
4 Au 89 7 Au 82  
5 B1u 1127 -134 B1u 1261  
6 B1u 644 -112 B1u 755  
7 B2g 507 -150 B2g 657  
8 B2u 1926 169 B2u 1757  
9 B2u 125 -140 B2u 265  
10 B3g 1886 168 B3g 1718  
11 B3g 354 -126 B3g 480  
12 B3u 329 -96 B3u 425 nu5 and nu8 switched from earlier work, such as 1983nou/che:1113
The calculated vibrational frequencies were scaled by 0.976

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.