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

Compare vibrational frequencies in CCCBDB for N2O4 (Dinitrogen tetroxide)

MP2/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 1243 -140 Ag 1383  
2 Ag 690 -117 Ag 807  
3 Ag 177 -88 Ag 265  
4 Au 84 2 Au 82  
5 B1u 1123 -138 B1u 1261  
6 B1u 634 -121 B1u 755  
7 B2g 492 -165 B2g 657  
8 B2u 1933 176 B2u 1757  
9 B2u 123 -142 B2u 265  
10 B3g 1893 175 B3g 1718  
11 B3g 351 -129 B3g 480  
12 B3u 316 -109 B3u 425 nu5 and nu8 switched from earlier work, such as 1983nou/che:1113
The calculated vibrational frequencies were scaled by 0.9663

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.