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

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

MP2/cc-pVTZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3053 35 Ag 3018  
2 Ag 2934 4 Ag 2930  
3 Ag 1659 -60 Ag 1719  
4 Ag 1396 -28 Ag 1424  
5 Ag 1334 -32 Ag 1366  
6 Ag 1245 -29 Ag 1274  
7 Ag 965 -39 Ag 1004  
8 Ag 668 -17 Ag 685  
9 Ag 503 -111 Ag 614  
10 Ag 345 -24 Ag 369  
11 Au 3011 21 Au 2990  
12 Au 1402 -19 Au 1421  
13 Au 918 -193 Au 1111  
14 Au 329 -10 Au 339  
15 Au 116        
16 Au 50 2 Au 48  
17 Bg 3011 33 Bg 2978  
18 Bg 1406 -18 Bg 1424  
19 Bg 1018 -91 Bg 1109  
20 Bg 588 50 Bg 538  
21 Bg 115 -125 Bg 240  
22 Bu 3053 42 Bu 3011  
23 Bu 2934 8 Bu 2926  
24 Bu 1660 -58 Bu 1718  
25 Bu 1396 -25 Bu 1421  
26 Bu 1320 -33 Bu 1353  
27 Bu 1088 -23 Bu 1111  
28 Bu 880 -47 Bu 927  
29 Bu 511 -23 Bu 534  
30 Bu 228 -22 Bu 250  
The calculated vibrational frequencies were scaled by 0.9495

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.