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

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

MP2/CEP-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3023 49 A' 2974  
2 A' 3018 65 A' 2953  
3 A' 2987 47 A' 2940  
4 A' 2922 46 A' 2876  
5 A' 2815 58 A' 2757  
6 A' 1672 -80 A' 1752  
7 A' 1458 -16 A' 1474  
8 A' 1455 6 A' 1449  
9 A' 1376 -23 A' 1399  
10 A' 1352 -29 A' 1381  
11 A' 1267 -62 A' 1329  
12 A' 1154 -28 A' 1182  
13 A' 1140 2 A' 1138  
14 A' 912 -10 A' 922  
15 A' 819 19 A' 800  
16 A' 514 -118 A' 632  
17 A' 331 -64 A' 395  
18 A' 314 42 A' 272  
19 A' 227 15 A' 212  
20 A" 3021 31 A" 2990  
21 A" 3014 32 A" 2982  
22 A" 2921 36 A" 2885  
23 A" 1443 -24 A" 1467  
24 A" 1437 -15 A" 1452  
25 A" 1361 -76 A" 1437  
26 A" 1299 9 A" 1290  
27 A" 1108 -1 A" 1109  
28 A" 957 -8 A" 965  
29 A" 914 -28 A" 942  
30 A" 899 -34 A" 933  
31 A" 312 -39 A" 351  
32 A" 205 -22 A" 227  
33 A" 59 -16 A" 75  
The calculated vibrational frequencies were scaled by 0.9494

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.