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

Compare vibrational frequencies in CCCBDB for CH3CONH2 (Acetamide)

PBEPBE/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A 3612 62 A 3550  
2 A 3469 19 A 3450  
3 A 3058 91 A 2967  
4 A 3041 141 A 2900  
5 A 2958 98 A 2860  
6 A 1662 -71 A 1733  
7 A 1597 -3 A 1600  
8 A 1467 34 A 1433  
9 A 1451 18 A 1433  
10 A 1379 -6 A 1385  
11 A 1333 14 A 1319  
12 A 1090 -44 A 1134  
13 A 1044 4 A 1040  
14 A 969 4 A 965  
15 A 826 -32 A 858  
16 A 671 46 A 625  
17 A 529 -19 A 548  
18 A 516 9 A 507  
19 A 475 48 A 427  
20 A 420 161 A 259  
21 A 22   A    
The calculated vibrational frequencies were scaled by 0.9862

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.