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

Compare vibrational frequencies in CCCBDB for C4H6O (Cyclobutanone)

BLYP/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3000 66 A1 2934  
2 A1 2971 79 A1 2892  
3 A1 1704 -110 A1 1814  
4 A1 1488 18 A1 1470  
5 A1 1441 40 A1 1401  
6 A1 1214 -77 A1 1291  
7 A1 926 -91 A1 1017  
8 A1 806 -42 A1 848  
9 A1 642 -25 A1 667  
10 A2 3019 40 A2 2979  
11 A2 1193 -3 A2 1196  
12 A2 938 -225 A2 1163  
13 A2 654 -255 A2 909  
14 B1 3054 49 B1 3005 B1 and B2 switched
15 B1 3013 34 B1 2979  
16 B1 1193 -16 B1 1209  
17 B1 1080 7 B1 1073  
18 B1 742 8 B1 734  
19 B1 394 -1 B1 395  
20 B1 61 -2 B1 63  
21 B2 2966 32 B2 2934 B1 and B2 switched
22 B2 1427 26 B2 1401  
23 B2 1246 -84 B2 1330  
24 B2 1174 -69 B2 1243  
25 B2 1031 -94 B2 1125  
26 B2 880 -77 B2 957  
27 B2 431 -26 B2 457  
The calculated vibrational frequencies were scaled by 0.9924

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.