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

Compare vibrational frequencies in CCCBDB for C4H2N2 (Fumaronitrile)

MP2/6-31+G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3079 29 Ag 3050  
2 Ag 2037 -193 Ag 2230  
3 Ag 1571 -39 Ag 1610  
4 Ag 1265 -30 Ag 1295  
5 Ag 976 -24 Ag 1000  
6 Ag 496 -38 Ag 534  
7 Ag 227 -34 Ag 261  
8 Au 921 -19 Au 940 numbering change from ref
9 Au 452 -93 Au 545 numbering change from ref
10 Au 112   Au   numbering change from ref
11 Bg 778 -67 Bg 845 numbering change from ref
12 Bg 314 -69 Bg 383 numbering change from ref
13 Bu 3084 34 Bu 3050  
14 Bu 2054 -189 Bu 2243  
15 Bu 1236 -23 Bu 1259  
16 Bu 966 -34 Bu 1000  
17 Bu 483 -51 Bu 534  
18 Bu 123 -25 Bu 148  
The calculated vibrational frequencies were scaled by 0.9406

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.