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

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

B1B95/6-31+G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3071 53 Ag 3018  
2 Ag 2952 22 Ag 2930  
3 Ag 1757 38 Ag 1719  
4 Ag 1393 -31 Ag 1424  
5 Ag 1343 -23 Ag 1366  
6 Ag 1245 -29 Ag 1274  
7 Ag 966 -38 Ag 1004  
8 Ag 672 -13 Ag 685  
9 Ag 505 -109 Ag 614  
10 Ag 339 -30 Ag 369  
11 Au 3021 31 Au 2990  
12 Au 1393 -28 Au 1421  
13 Au 909 -202 Au 1111  
14 Au 333 -6 Au 339  
15 Au 101        
16 Au 54 6 Au 48  
17 Bg 3021 43 Bg 2978  
18 Bg 1399 -25 Bg 1424  
19 Bg 1016 -93 Bg 1109  
20 Bg 589 51 Bg 538  
21 Bg 100 -140 Bg 240  
22 Bu 3072 61 Bu 3011  
23 Bu 2951 25 Bu 2926  
24 Bu 1755 37 Bu 1718  
25 Bu 1394 -27 Bu 1421  
26 Bu 1329 -24 Bu 1353  
27 Bu 1092 -19 Bu 1111  
28 Bu 884 -43 Bu 927  
29 Bu 516 -18 Bu 534  
30 Bu 219 -31 Bu 250  
The calculated vibrational frequencies were scaled by 0.9566

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.