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

Compare vibrational frequencies in CCCBDB for NO2 (Nitrogen dioxide)

CCSD(T)/cc-pVTZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2626 1308 A1 1318  
2 A1 2397 1647 A1 750  
3 B2 2859 1241 B2 1618  
The calculated vibrational frequencies were scaled by 0.9748

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.