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

Compare vibrational frequencies in CCCBDB for N2O3 (Dinitrogen trioxide)

PBEPBE/cc-pVTZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 1853 21 A' 1832  
2 A' 1655 3 A' 1652  
3 A' 1318 13 A' 1305  
4 A' 784 11 A' 773  
5 A' 612 -15 A' 627  
6 A' 270 29 A' 241  
7 A' 191 -14 A' 205  
8 A" 417 3 A" 414  
9 A" 134 71 A" 63  
The calculated vibrational frequencies were scaled by 0.9931

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.