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

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

B3PW91/cc-pVTZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3044 26 Ag 3018  
2 Ag 2935 5 Ag 2930  
3 Ag 1733 14 Ag 1719  
4 Ag 1391 -33 Ag 1424  
5 Ag 1335 -31 Ag 1366  
6 Ag 1234 -40 Ag 1274  
7 Ag 970 -34 Ag 1004  
8 Ag 664 -21 Ag 685  
9 Ag 502 -112 Ag 614  
10 Ag 346 -23 Ag 369  
11 Au 2994 4 Au 2990  
12 Au 1393 -28 Au 1421  
13 Au 913 -198 Au 1111  
14 Au 336 -3 Au 339  
15 Au 110        
16 Au 45 -3 Au 48  
17 Bg 2995 17 Bg 2978  
18 Bg 1398 -26 Bg 1424  
19 Bg 1026 -83 Bg 1109  
20 Bg 598 60 Bg 538  
21 Bg 106 -134 Bg 240  
22 Bu 3045 34 Bu 3011  
23 Bu 2935 9 Bu 2926  
24 Bu 1735 17 Bu 1718  
25 Bu 1391 -30 Bu 1421  
26 Bu 1326 -27 Bu 1353  
27 Bu 1091 -20 Bu 1111  
28 Bu 878 -49 Bu 927  
29 Bu 522 -12 Bu 534  
30 Bu 228 -22 Bu 250  
The calculated vibrational frequencies were scaled by 0.9616

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.