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

Compare vibrational frequencies in CCCBDB for CH3CH2CHO (Propanal)

PBEPBE/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3052 71 A' 2981  
2 A' 2976 72 A' 2904  
3 A' 2933 38 A' 2895  
4 A' 2767 -42 A' 2809  
5 A' 1670 -73 A' 1743  
6 A' 1503 43 A' 1460  
7 A' 1439 23 A' 1416  
8 A' 1406 16 A' 1390  
9 A' 1380 4 A' 1376  
10 A' 1302 -33 A' 1335  
11 A' 1079 -14 A' 1093  
12 A' 989 -4 A' 993  
13 A' 828 -20 A' 848  
14 A' 660 -8 A' 668  
15 A' 258 -13 A' 271  
16 A" 3049 57 A" 2992  
17 A" 2962 20 A" 2942  
18 A" 1503 52 A" 1451  
19 A" 1263 13 A" 1250  
20 A" 1119 1 A" 1118  
21 A" 897 5 A" 892  
22 A" 667 7 A" 660  
23 A" 232 12 A" 220  
24 A" 106 -29 A" 135  
The calculated vibrational frequencies were scaled by 0.9909

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.