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

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

CCD/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3016 -2 Ag 3018  
2 Ag 2917 -13 Ag 2930  
3 Ag 1657 -62 Ag 1719  
4 Ag 1467 43 Ag 1424  
5 Ag 1407 41 Ag 1366  
6 Ag 1281 7 Ag 1274  
7 Ag 1015 11 Ag 1004  
8 Ag 676 -9 Ag 685  
9 Ag 524 -90 Ag 614  
10 Ag 358 -11 Ag 369  
11 Au 2983 -7 Au 2990  
12 Au 1462 41 Au 1421  
13 Au 990 -121 Au 1111  
14 Au 348 9 Au 339  
15 Au 120        
16 Au 61 13 Au 48  
17 Bg 2983 5 Bg 2978  
18 Bg 1464 40 Bg 1424  
19 Bg 1061 -48 Bg 1109  
20 Bg 598 60 Bg 538  
21 Bg 120 -120 Bg 240  
22 Bu 3016 5 Bu 3011  
23 Bu 2917 -9 Bu 2926  
24 Bu 1645 -73 Bu 1718  
25 Bu 1467 46 Bu 1421  
26 Bu 1406 53 Bu 1353  
27 Bu 1132 21 Bu 1111  
28 Bu 920 -7 Bu 927  
29 Bu 533 -1 Bu 534  
30 Bu 235 -15 Bu 250  
The calculated vibrational frequencies were scaled by 0.9595

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.