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

Compare vibrational frequencies in CCCBDB for CH3CH2CHO (Propanal)

BLYP/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3038 57 A' 2981  
2 A' 2975 71 A' 2904  
3 A' 2928 33 A' 2895  
4 A' 2757 -52 A' 2809  
5 A' 1656 -87 A' 1743  
6 A' 1520 60 A' 1460  
7 A' 1459 43 A' 1416  
8 A' 1421 31 A' 1390  
9 A' 1389 13 A' 1376  
10 A' 1310 -25 A' 1335  
11 A' 1077 -16 A' 1093  
12 A' 977 -16 A' 993  
13 A' 805 -43 A' 848  
14 A' 656 -12 A' 668  
15 A' 257 -14 A' 271  
16 A" 3036 44 A" 2992  
17 A" 2948 6 A" 2942  
18 A" 1519 68 A" 1451  
19 A" 1273 23 A" 1250  
20 A" 1128 10 A" 1118  
21 A" 900 8 A" 892  
22 A" 676 16 A" 660  
23 A" 228 8 A" 220  
24 A" 106 -29 A" 135  
The calculated vibrational frequencies were scaled by 0.9935

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.