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

Compare vibrational frequencies in CCCBDB for C4H4N2 (Succinonitrile)

PBEPBE/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 2978 31 Ag 2947 renumbered from paper
2 Ag 2099 -155 Ag 2254  
3 Ag 1433 11 Ag 1422  
4 Ag 1303 -25 Ag 1328  
5 Ag 976 -47 Ag 1023  
6 Ag 889 80 Ag 809  
7 Ag 456 -52 Ag 508  
8 Ag 200 13 Ag 187  
9 Au 3078 93 Au 2985  
10 Au 1136 -61 Au 1197  
11 Au 727 -33 Au 760  
12 Au 345 -12 Au 357 from gauche form
13 Au 64   Au    
14 Bg 3065 83 Bg 2982  
15 Bg 1235 9 Bg 1226  
16 Bg 978 27 Bg 951  
17 Bg 314 -73 Bg 387  
18 Bu 2986 21 Bu 2965  
19 Bu 2102 -153 Bu 2255  
20 Bu 1448 23 Bu 1425  
21 Bu 1217 -53 Bu 1270  
22 Bu 853 -64 Bu 917  
23 Bu 462 -64 Bu 526  
24 Bu 117   Bu    
The calculated vibrational frequencies were scaled by 0.9136

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.