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

Compare vibrational frequencies in CCCBDB for CH3COCl (Acetyl Chloride)

HF/6-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3005 -22 A' 3027  
2 A' 2910 -38 A' 2948  
3 A' 1783 -35 A' 1818  
4 A' 1460 45 A' 1415  
5 A' 1424 56 A' 1368  
6 A' 1116 8 A' 1108  
7 A' 952 -4 A' 956  
8 A' 558 -46 A' 604  
9 A' 413 -32 A' 445  
10 A' 324 -24 A' 348  
11 A" 2985 -5 A" 2990  
12 A" 1463 32 A" 1431  
13 A" 1073 41 A" 1032  
14 A" 503 -15 A" 518  
15 A" 134 -32 A" 166  
The calculated vibrational frequencies were scaled by 0.9029

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.