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

Compare vibrational frequencies in CCCBDB for C4H6O (Cyclobutanone)

MP2=FULL/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2956 22 A1 2934  
2 A1 2936 44 A1 2892  
3 A1 1621 -193 A1 1814  
4 A1 1489 19 A1 1470  
5 A1 1453 52 A1 1401  
6 A1 1223 -68 A1 1291  
7 A1 919 -98 A1 1017  
8 A1 807 -41 A1 848  
9 A1 638 -29 A1 667  
10 A2 2994 15 A2 2979  
11 A2 1191 -5 A2 1196  
12 A2 940 -223 A2 1163  
13 A2 690 -219 A2 909  
14 B1 3018 13 B1 3005 B1 and B2 switched
15 B1 2987 8 B1 2979  
16 B1 1181 -28 B1 1209  
17 B1 1083 10 B1 1073  
18 B1 744 10 B1 734  
19 B1 384 -11 B1 395  
20 B1 57 -6 B1 63  
21 B2 2933 -1 B2 2934 B1 and B2 switched
22 B2 1444 43 B2 1401  
23 B2 1238 -92 B2 1330  
24 B2 1186 -57 B2 1243  
25 B2 1049 -76 B2 1125  
26 B2 881 -76 B2 957  
27 B2 433 -24 B2 457  
The calculated vibrational frequencies were scaled by 0.9501

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.