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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 2900 -30 Ag 2930  
3 Ag 1829 110 Ag 1719  
4 Ag 1443 19 Ag 1424  
5 Ag 1400 34 Ag 1366  
6 Ag 1278 4 Ag 1274  
7 Ag 1007 3 Ag 1004  
8 Ag 675 -10 Ag 685  
9 Ag 521 -93 Ag 614  
10 Ag 350 -19 Ag 369  
11 Au 2955 -35 Au 2990  
12 Au 1446 25 Au 1421  
13 Au 966 -145 Au 1111  
14 Au 356 17 Au 339  
15 Au 122        
16 Au 52 4 Au 48  
17 Bg 2954 -24 Bg 2978  
18 Bg 1449 25 Bg 1424  
19 Bg 1072 -37 Bg 1109  
20 Bg 620 82 Bg 538  
21 Bg 122 -118 Bg 240  
22 Bu 2988 -23 Bu 3011  
23 Bu 2900 -26 Bu 2926  
24 Bu 1806 88 Bu 1718  
25 Bu 1444 23 Bu 1421  
26 Bu 1389 36 Bu 1353  
27 Bu 1116 5 Bu 1111  
28 Bu 895 -32 Bu 927  
29 Bu 532 -2 Bu 534  
30 Bu 232 -18 Bu 250  
The calculated vibrational frequencies were scaled by 0.9044

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.