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

Compare vibrational frequencies in CCCBDB for N2O3 (Dinitrogen trioxide)

HF/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 1772 -60 A' 1832  
2 A' 1568 -84 A' 1652  
3 A' 1307 2 A' 1305  
4 A' 763 -10 A' 773  
5 A' 719 92 A' 627  
6 A' 344 103 A' 241  
7 A' 295 90 A' 205  
8 A" 559 145 A" 414  
9 A" 127 64 A" 63  
The calculated vibrational frequencies were scaled by 0.9029

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.