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

Compare vibrational frequencies in CCCBDB for N2O3 (Dinitrogen trioxide)

mPW1PW91/6-31G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 1878 46 A' 1832  
2 A' 1747 95 A' 1652  
3 A' 1371 66 A' 1305  
4 A' 788 15 A' 773  
5 A' 673 46 A' 627  
6 A' 297 56 A' 241  
7 A' 229 24 A' 205  
8 A" 471 57 A" 414  
9 A" 140 77 A" 63  
The calculated vibrational frequencies were scaled by 0.9515

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.