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

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

CID/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3022 4 Ag 3018  
2 Ag 2935 5 Ag 2930  
3 Ag 1714 -5 Ag 1719  
4 Ag 1471 47 Ag 1424  
5 Ag 1408 42 Ag 1366  
6 Ag 1224 -50 Ag 1274  
7 Ag 1002 -2 Ag 1004  
8 Ag 645 -40 Ag 685  
9 Ag 530 -84 Ag 614  
10 Ag 359 -10 Ag 369  
11 Au 2990 0 Au 2990  
12 Au 1483 62 Au 1421  
13 Au 996 -115 Au 1111  
14 Au 377 38 Au 339  
15 Au 119        
16 Au 73 25 Au 48  
17 Bg 2990 12 Bg 2978  
18 Bg 1486 62 Bg 1424  
19 Bg 1086 -23 Bg 1109  
20 Bg 650 112 Bg 538  
21 Bg 101 -139 Bg 240  
22 Bu 3022 11 Bu 3011  
23 Bu 2934 8 Bu 2926  
24 Bu 1698 -20 Bu 1718  
25 Bu 1472 51 Bu 1421  
26 Bu 1407 54 Bu 1353  
27 Bu 1117 6 Bu 1111  
28 Bu 884 -43 Bu 927  
29 Bu 518 -16 Bu 534  
30 Bu 239 -11 Bu 250  
The calculated vibrational frequencies were scaled by 0.9305

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.