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

Compare vibrational frequencies in CCCBDB for CH3CONH2 (Acetamide)

mPW1PW91/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A 3595 45 A 3550  
2 A 3459 9 A 3450  
3 A 3044 77 A 2967  
4 A 2995 95 A 2900  
5 A 2919 59 A 2860  
6 A 1669 -64 A 1733  
7 A 1597 -3 A 1600  
8 A 1457 24 A 1433  
9 A 1439 6 A 1433  
10 A 1374 -11 A 1385  
11 A 1338 19 A 1319  
12 A 1092 -42 A 1134  
13 A 1041 1 A 1040  
14 A 969 4 A 965  
15 A 829 -29 A 858  
16 A 659 34 A 625  
17 A 535 -13 A 548  
18 A 520 14 A 507  
19 A 484 57 A 427  
20 A 408 149 A 259  
21 A 41   A    
The calculated vibrational frequencies were scaled by 0.9466

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.