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

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

B3PW91/6-31G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3011 37 A' 2974  
2 A' 3002 49 A' 2953  
3 A' 2960 20 A' 2940  
4 A' 2924 48 A' 2876  
5 A' 2742 -15 A' 2757  
6 A' 1773 21 A' 1752  
7 A' 1456 -18 A' 1474  
8 A' 1449 0 A' 1449  
9 A' 1373 -26 A' 1399  
10 A' 1359 -22 A' 1381  
11 A' 1260 -69 A' 1329  
12 A' 1136 -46 A' 1182  
13 A' 1133 -5 A' 1138  
14 A' 891 -31 A' 922  
15 A' 817 17 A' 800  
16 A' 523 -109 A' 632  
17 A' 339 -56 A' 395  
18 A' 316 44 A' 272  
19 A' 222 10 A' 212  
20 A" 3011 21 A" 2990  
21 A" 2997 15 A" 2982  
22 A" 2922 37 A" 2885  
23 A" 1437 -30 A" 1467  
24 A" 1433 -19 A" 1452  
25 A" 1348 -89 A" 1437  
26 A" 1292 2 A" 1290  
27 A" 1096 -13 A" 1109  
28 A" 953 -12 A" 965  
29 A" 918 -24 A" 942  
30 A" 897 -36 A" 933  
31 A" 312 -39 A" 351  
32 A" 207 -20 A" 227  
33 A" 63 -12 A" 75  
The calculated vibrational frequencies were scaled by 0.9584

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.