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

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

B1B95/cc-pVDZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3089 71 Ag 3018  
2 Ag 2964 34 Ag 2930  
3 Ag 1776 57 Ag 1719  
4 Ag 1371 -53 Ag 1424  
5 Ag 1339 -27 Ag 1366  
6 Ag 1248 -26 Ag 1274  
7 Ag 970 -34 Ag 1004  
8 Ag 678 -7 Ag 685  
9 Ag 512 -102 Ag 614  
10 Ag 352 -17 Ag 369  
11 Au 3040 50 Au 2990  
12 Au 1377 -44 Au 1421  
13 Au 906 -205 Au 1111  
14 Au 342 3 Au 339  
15 Au 154        
16 Au 64 16 Au 48  
17 Bg 3040 62 Bg 2978  
18 Bg 1383 -41 Bg 1424  
19 Bg 1021 -88 Bg 1109  
20 Bg 605 67 Bg 538  
21 Bg 148 -92 Bg 240  
22 Bu 3089 78 Bu 3011  
23 Bu 2964 38 Bu 2926  
24 Bu 1773 55 Bu 1718  
25 Bu 1372 -49 Bu 1421  
26 Bu 1314 -39 Bu 1353  
27 Bu 1095 -16 Bu 1111  
28 Bu 890 -37 Bu 927  
29 Bu 515 -19 Bu 534  
30 Bu 233 -17 Bu 250  
The calculated vibrational frequencies were scaled by 0.9612

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.