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

Compare vibrational frequencies in CCCBDB for C4H6O2 (2,3-Butanedione)

HF/6-311G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 2988 -30 Ag 3018  
2 Ag 2897 -33 Ag 2930  
3 Ag 1836 117 Ag 1719  
4 Ag 1433 9 Ag 1424  
5 Ag 1394 28 Ag 1366  
6 Ag 1280 6 Ag 1274  
7 Ag 1005 1 Ag 1004  
8 Ag 678 -7 Ag 685  
9 Ag 523 -91 Ag 614  
10 Ag 352 -17 Ag 369  
11 Au 2954 -36 Au 2990  
12 Au 1437 16 Au 1421  
13 Au 960 -151 Au 1111  
14 Au 357 18 Au 339  
15 Au 120        
16 Au 51 3 Au 48  
17 Bg 2954 -24 Bg 2978  
18 Bg 1440 16 Bg 1424  
19 Bg 1071 -38 Bg 1109  
20 Bg 619 81 Bg 538  
21 Bg 120 -120 Bg 240  
22 Bu 2989 -22 Bu 3011  
23 Bu 2896 -30 Bu 2926  
24 Bu 1813 95 Bu 1718  
25 Bu 1434 13 Bu 1421  
26 Bu 1381 28 Bu 1353  
27 Bu 1116 5 Bu 1111  
28 Bu 894 -33 Bu 927  
29 Bu 535 1 Bu 534  
30 Bu 234 -16 Bu 250  
The calculated vibrational frequencies were scaled by 0.9085

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.