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

Compare vibrational frequencies in CCCBDB for N2H2 (trans-diazine)

HSEh1PBE/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3096 -32 Ag 3128  
2 Ag 3096 1513 Ag 1583  
3 Ag 1625 96 Ag 1529  
4 Ag 1625 336 Au 1289  
5 Ag 1563 -1558 Bu 3120  
6 Ag 1563 246 Bu 1316  
7 Au 1299        
8 Au 1299        
9 Bu 3121        
10 Bu 3121        
11 Bu 1313        
12 Bu 1313        
The calculated vibrational frequencies were scaled by 0.951

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.