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

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

BLYP/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3027 53 A' 2974  
2 A' 3024 71 A' 2953  
3 A' 2995 55 A' 2940  
4 A' 2956 80 A' 2876  
5 A' 2708 -49 A' 2757  
6 A' 1666 -86 A' 1752  
7 A' 1529 55 A' 1474  
8 A' 1524 75 A' 1449  
9 A' 1420 21 A' 1399  
10 A' 1396 15 A' 1381  
11 A' 1290 -39 A' 1329  
12 A' 1166 -16 A' 1182  
13 A' 1144 6 A' 1138  
14 A' 862 -60 A' 922  
15 A' 814 14 A' 800  
16 A' 516 -116 A' 632  
17 A' 337 -58 A' 395  
18 A' 328 56 A' 272  
19 A' 226 14 A' 212  
20 A" 3025 35 A" 2990  
21 A" 3012 30 A" 2982  
22 A" 2953 68 A" 2885  
23 A" 1511 44 A" 1467  
24 A" 1509 57 A" 1452  
25 A" 1402 -35 A" 1437  
26 A" 1327 37 A" 1290  
27 A" 1095 -14 A" 1109  
28 A" 962 -3 A" 965  
29 A" 953 11 A" 942  
30 A" 920 -13 A" 933  
31 A" 331 -20 A" 351  
32 A" 216 -11 A" 227  
33 A" 75 -0 A" 75  
The calculated vibrational frequencies were scaled by 0.9945

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.