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

Compare vibrational frequencies in CCCBDB for CH3CO (Acetyl radical)

QCISD/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 2990        
2 A' 2914        
3 A' 1493 -382 A' 1875 matrix
4 A' 1439 19 A' 1420 matrix
5 A' 1352        
6 A' 1028        
7 A' 749        
8 A' 420        
9 A" 2997        
10 A" 1486        
11 A" 969        
12 A" 101        
The calculated vibrational frequencies were scaled by 0.9611

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.