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

Compare vibrational frequencies in CCCBDB for CH3COOH (Acetic acid)

MP2=FULL/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3343 -240 A' 3583  
2 A' 3074 23 A' 3051  
3 A' 2975 31 A' 2944  
4 A' 1674 -114 A' 1788  
5 A' 1503 73 A' 1430  
6 A' 1412 30 A' 1382  
7 A' 1326 62 A' 1264  
8 A' 1133 -49 A' 1182  
9 A' 964 -25 A' 989  
10 A' 793 -54 A' 847  
11 A' 541 -116 A' 657  
12 A' 390   A'   questionable (581 listed)
13 A" 3043 47 A" 2996  
14 A" 1511 81 A" 1430  
15 A" 1081 33 A" 1048  
16 A" 632 -10 A" 642  
17 A" 529 -5 A" 534  
18 A" 107 14 A" 93  
The calculated vibrational frequencies were scaled by 0.9548

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.