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

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

HF/cc-pVDZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3011 -7 Ag 3018  
2 Ag 2909 -21 Ag 2930  
3 Ag 1843 124 Ag 1719  
4 Ag 1413 -11 Ag 1424  
5 Ag 1386 20 Ag 1366  
6 Ag 1285 11 Ag 1274  
7 Ag 1001 -3 Ag 1004  
8 Ag 683 -2 Ag 685  
9 Ag 525 -89 Ag 614  
10 Ag 354 -15 Ag 369  
11 Au 2978 -12 Au 2990  
12 Au 1420 -1 Au 1421  
13 Au 955 -156 Au 1111  
14 Au 358 19 Au 339  
15 Au 128        
16 Au 58 10 Au 48  
17 Bg 2978 -0 Bg 2978  
18 Bg 1424 -0 Bg 1424  
19 Bg 1068 -41 Bg 1109  
20 Bg 621 83 Bg 538  
21 Bg 127 -113 Bg 240  
22 Bu 3011 0 Bu 3011  
23 Bu 2908 -18 Bu 2926  
24 Bu 1819 101 Bu 1718  
25 Bu 1413 -8 Bu 1421  
26 Bu 1367 14 Bu 1353  
27 Bu 1114 3 Bu 1111  
28 Bu 898 -29 Bu 927  
29 Bu 532 -2 Bu 534  
30 Bu 236 -14 Bu 250  
The calculated vibrational frequencies were scaled by 0.908

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.