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

Compare vibrational frequencies in CCCBDB for CH3CH2CHO (Propanal)

LSDA/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3040 59 A' 2981  
2 A' 2953 49 A' 2904  
3 A' 2908 13 A' 2895  
4 A' 2742 -67 A' 2809  
5 A' 1704 -39 A' 1743  
6 A' 1470 10 A' 1460  
7 A' 1405 -11 A' 1416  
8 A' 1383 -7 A' 1390  
9 A' 1363 -13 A' 1376  
10 A' 1291 -44 A' 1335  
11 A' 1087 -6 A' 1093  
12 A' 993 -0 A' 993  
13 A' 863 15 A' 848  
14 A' 672 4 A' 668  
15 A' 268 -3 A' 271  
16 A" 3028 36 A" 2992  
17 A" 2939 -3 A" 2942  
18 A" 1469 18 A" 1451  
19 A" 1240 -10 A" 1250  
20 A" 1110 -8 A" 1118  
21 A" 892 -0 A" 892  
22 A" 660 0 A" 660  
23 A" 248 28 A" 220  
24 A" 104 -31 A" 135  
The calculated vibrational frequencies were scaled by 0.982

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.