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

Compare vibrational frequencies in CCCBDB for N2O3 (Dinitrogen trioxide)

LSDA/6-31G(2df,p)

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 1884 52 A' 1832  
2 A' 1780 128 A' 1652  
3 A' 1379 74 A' 1305  
4 A' 795 22 A' 773  
5 A' 663 36 A' 627  
6 A' 311 70 A' 241  
7 A' 216 11 A' 205  
8 A" 453 39 A" 414  
9 A" 153 90 A" 63  
The calculated vibrational frequencies were scaled by 0.984

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.