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

Compare vibrational frequencies in CCCBDB for C4H2N2 (Fumaronitrile)

MP2/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3066 16 Ag 3050  
2 Ag 1990 -240 Ag 2230  
3 Ag 1579 -31 Ag 1610  
4 Ag 1309 14 Ag 1295  
5 Ag 979 -21 Ag 1000  
6 Ag 496 -38 Ag 534  
7 Ag 227 -34 Ag 261  
8 Au 946 6 Au 940 numbering change from ref
9 Au 461 -84 Au 545 numbering change from ref
10 Au 109   Au   numbering change from ref
11 Bg 818 -27 Bg 845 numbering change from ref
12 Bg 284 -99 Bg 383 numbering change from ref
13 Bu 3071 21 Bu 3050  
14 Bu 2004 -239 Bu 2243  
15 Bu 1292 33 Bu 1259  
16 Bu 952 -48 Bu 1000  
17 Bu 485 -49 Bu 534  
18 Bu 124 -24 Bu 148  
The calculated vibrational frequencies were scaled by 0.9568

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.