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

Compare vibrational frequencies in CCCBDB for C4H4N2 (Succinonitrile)

MP2/CEP-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 2969 22 Ag 2947 renumbered from paper
2 Ag 2062 -192 Ag 2254  
3 Ag 1429 7 Ag 1422  
4 Ag 1340 12 Ag 1328  
5 Ag 1012 -11 Ag 1023  
6 Ag 920 111 Ag 809  
7 Ag 474 -34 Ag 508  
8 Ag 198 11 Ag 187  
9 Au 3050 65 Au 2985  
10 Au 1169 -28 Au 1197  
11 Au 733 -27 Au 760  
12 Au 350 -7 Au 357 from gauche form
13 Au 77   Au    
14 Bg 3035 53 Bg 2982  
15 Bg 1277 51 Bg 1226  
16 Bg 982 31 Bg 951  
17 Bg 308 -79 Bg 387  
18 Bu 2974 9 Bu 2965  
19 Bu 2065 -190 Bu 2255  
20 Bu 1433 8 Bu 1425  
21 Bu 1225 -45 Bu 1270  
22 Bu 883 -34 Bu 917  
23 Bu 470 -56 Bu 526  
24 Bu 116   Bu    
The calculated vibrational frequencies were scaled by 0.9494

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.