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

Compare vibrational frequencies in CCCBDB for CHOCH(CH3)CH3 (Propanal, 2-methyl-)

B3LYP/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3005 31 A' 2974  
2 A' 3003 50 A' 2953  
3 A' 2976 36 A' 2940  
4 A' 2933 57 A' 2876  
5 A' 2747 -10 A' 2757  
6 A' 1685 -67 A' 1752  
7 A' 1514 40 A' 1474  
8 A' 1509 60 A' 1449  
9 A' 1414 15 A' 1399  
10 A' 1390 9 A' 1381  
11 A' 1288 -41 A' 1329  
12 A' 1163 -19 A' 1182  
13 A' 1146 8 A' 1138  
14 A' 874 -48 A' 922  
15 A' 816 16 A' 800  
16 A' 518 -114 A' 632  
17 A' 336 -59 A' 395  
18 A' 328 56 A' 272  
19 A' 229 17 A' 212  
20 A" 3003 13 A" 2990  
21 A" 2990 8 A" 2982  
22 A" 2930 45 A" 2885  
23 A" 1496 29 A" 1467  
24 A" 1494 42 A" 1452  
25 A" 1395 -42 A" 1437  
26 A" 1319 29 A" 1290  
27 A" 1100 -9 A" 1109  
28 A" 959 -6 A" 965  
29 A" 952 10 A" 942  
30 A" 925 -8 A" 933  
31 A" 330 -21 A" 351  
32 A" 216 -11 A" 227  
33 A" 74 -1 A" 75  
The calculated vibrational frequencies were scaled by 0.962

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.