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

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

MP2=FULL/cc-pVTZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3056 38 Ag 3018  
2 Ag 2951 20 Ag 2930  
3 Ag 1671 -48 Ag 1719  
4 Ag 1405 -19 Ag 1424  
5 Ag 1343 -23 Ag 1366  
6 Ag 1255 -19 Ag 1274  
7 Ag 969 -35 Ag 1004  
8 Ag 675 -10 Ag 685  
9 Ag 509 -105 Ag 614  
10 Ag 350 -19 Ag 369  
11 Au 3014 24 Au 2990  
12 Au 1411 -10 Au 1421  
13 Au 919 -192 Au 1111  
14 Au 340 1 Au 339  
15 Au 132        
16 Au 57 9 Au 48  
17 Bg 3014 36 Bg 2978  
18 Bg 1416 -8 Bg 1424  
19 Bg 1023 -86 Bg 1109  
20 Bg 602 64 Bg 538  
21 Bg 133 -107 Bg 240  
22 Bu 3057 46 Bu 3011  
23 Bu 2951 25 Bu 2926  
24 Bu 1672 -46 Bu 1718  
25 Bu 1406 -15 Bu 1421  
26 Bu 1328 -25 Bu 1353  
27 Bu 1095 -16 Bu 1111  
28 Bu 886 -41 Bu 927  
29 Bu 515 -19 Bu 534  
30 Bu 232 -18 Bu 250  
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.